一些开发中用到的方法

发表于 更新于 分类于 阅读次数：

0x00 前言

本文是一些我在开发过程中用到的比较有用、能用且好用的方法等一些干货。
将这些写成一篇文章，以后用到也能比较快的找到。

0x01 iOS

0x0100 获取 APP 信息

  • 获取 App 的版本号：
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+ (NSString *)appVersion {
    return [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleShortVersionString"];
}
  • 获取 App 的 Build 号：
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+ (NSString *)appBuildNumber {
    return [[[NSBundle mainBundle] infoDictionary] objectForKey:(NSString *)kCFBundleVersionKey];
}

0x0101 获取设备信息

  • 获取 deviceModel：
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+ (NSString *)deviceModel {
    struct utsname systemInfo;
    uname(&systemInfo);
    return [NSString stringWithCString:systemInfo.machine encoding:NSUTF8StringEncoding];
}
  • 获取 Nodename：
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+ (NSString *)deviceNodename {
    struct utsname systemInfo;
    uname(&systemInfo);
    return [NSString stringWithCString:systemInfo.nodename encoding:NSUTF8StringEncoding];
}
  • 获取手机型号：
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- (NSString *)modelName {
    NSString *machine = [MLBUtilities deviceModel];
    
    if ([machine isEqualToString:@"iPod5,1"]) {
        return @"iPod Touch 5";
    } else if ([machine isEqualToString:@"iPod7,1"]) {
        return @"iPod Touch 6";
    } else if ([machine isEqualToString:@"iPhone3,1"] || [machine isEqualToString:@"iPhone3,2"] || [machine isEqualToString:@"iPhone3,3"]) {
        return @"iPhone 4";
    } else if ([machine isEqualToString:@"iPhone4,1"]) {
        return @"iPhone 4s";
    } else if ([machine isEqualToString:@"iPhone5,1"] || [machine isEqualToString:@"iPhone5,2"]) {
        return @"iPhone 5";
    } else if ([machine isEqualToString:@"iPhone5,3"] || [machine isEqualToString:@"iPhone5,4"]) {
        return @"iPhone 5c";
    } else if ([machine isEqualToString:@"iPhone6,1"] || [machine isEqualToString:@"iPhone6,2"]) {
        return @"iPhone 5s";
    } else if ([machine isEqualToString:@"iPhone7,2"]) {
        return @"iPhone 6";
    } else if ([machine isEqualToString:@"iPhone7,1"]) {
        return @"iPhone 6 Plus";
    } else if ([machine isEqualToString:@"iPhone8,1"]) {
        return @"iPhone 6s";
    } else if ([machine isEqualToString:@"iPhone8,2"]) {
        return @"iPhone 6s Plus";
    } else if ([machine isEqualToString:@"iPhone8,4"]) {
        return @"iPhone SE";
    } else if ([machine isEqualToString:@"iPhone9,1"] || [machine isEqualToString:@"iPhone9,3"]) {
        return @"iPhone 7";
    } else if ([machine isEqualToString:@"iPhone9,2"] || [machine isEqualToString:@"iPhone9,4"]) {
        return @"iPhone 7 Plus";
    } else if ([machine isEqualToString:@"iPhone10,1"] || [machine isEqualToString:@"iPhone10,4"]) {
        return @"iPhone 8";
    } else if ([machine isEqualToString:@"iPhone10,2"] || [machine isEqualToString:@"iPhone10,5"]) {
        return @"iPhone 8 Plus";
    } else if ([machine isEqualToString:@"iPhone10,3"] || [machine isEqualToString:@"iPhone10,6"]) {
        return @"iPhone X";
    } else if ([machine isEqualToString:@"iPad2,1"] || [machine isEqualToString:@"iPad2,2"] || [machine isEqualToString:@"iPad2,3"] || [machine isEqualToString:@"iPad2,4"]) {
        return @"iPad 2";
    } else if ([machine isEqualToString:@"iPad3,1"] || [machine isEqualToString:@"iPad3,2"] || [machine isEqualToString:@"iPad3,3"]) {
        return @"iPad 3";
    } else if ([machine isEqualToString:@"iPad3,4"] || [machine isEqualToString:@"iPad3,5"] || [machine isEqualToString:@"iPad3,6"]) {
        return @"iPad 4";
    } else if ([machine isEqualToString:@"iPad4,1"] || [machine isEqualToString:@"iPad4,2"] || [machine isEqualToString:@"iPad4,3"]) {
        return @"iPad Air";
    } else if ([machine isEqualToString:@"iPad5,3"] || [machine isEqualToString:@"iPad5,4"]) {
        return @"iPad Air 2";
    } else if ([machine isEqualToString:@"iPad6,11"] || [machine isEqualToString:@"iPad6,12"]) {
        return @"iPad 5";
    } else if ([machine isEqualToString:@"iPad2,5"] || [machine isEqualToString:@"iPad2,6"] || [machine isEqualToString:@"iPad2,7"]) {
        return @"iPad Mini";
    } else if ([machine isEqualToString:@"iPad4,4"] || [machine isEqualToString:@"iPad4,5"] || [machine isEqualToString:@"iPad4,6"]) {
        return @"iPad Mini 2";
    } else if ([machine isEqualToString:@"iPad4,7"] || [machine isEqualToString:@"iPad4,8"] || [machine isEqualToString:@"iPad4,9"]) {
        return @"iPad Mini 3";
    } else if ([machine isEqualToString:@"iPad5,1"] || [machine isEqualToString:@"iPad5,2"]) {
        return @"iPad Mini 4";
    } else if ([machine isEqualToString:@"iPad6,3"] || [machine isEqualToString:@"iPad6,4"]) {
        return @"iPad Pro 9.7 Inch";
    } else if ([machine isEqualToString:@"iPad6,7"] || [machine isEqualToString:@"iPad6,8"]) {
        return @"iPad Pro 12.9 Inch";
    } else if ([machine isEqualToString:@"iPad7,1"] || [machine isEqualToString:@"iPad7,2"]) {
        return @"iPad Pro 12.9 Inch 2. Generation";
    } else if ([machine isEqualToString:@"iPad7,3"] || [machine isEqualToString:@"iPad7,4"]) {
        return @"iPad Pro 10.5 Inch";
    } else if ([machine isEqualToString:@"AppleTV5,3"]) {
        return @"Apple TV";
    } else if ([machine isEqualToString:@"i386"] || [machine isEqualToString:@"x86_64"]) {
        return [NSString stringWithFormat:@"%@-Simulator", self.localizedModel];
    } else {
        return machine;
    }
}

0x0102 地图相关

  • 打开系统地图：
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+ (void)openMapWithlatitude:(double)latitude longitude:(double)longitude name:(NSString *)name {
    CLLocationDistance regionDistance = 500;
    CLLocationCoordinate2D coord = CLLocationCoordinate2DMake(latitude, longitude);
    CLLocationCoordinate2D coordGCJ = [self transformFromWGSToGCJ:coord];
    MKCoordinateRegion regionSpan = MKCoordinateRegionMakeWithDistance(coordGCJ, regionDistance, regionDistance);
    NSDictionary *options = @{MKLaunchOptionsMapCenterKey : [NSValue valueWithMKCoordinate:regionSpan.center],
                              MKLaunchOptionsMapSpanKey : [NSValue valueWithMKCoordinateSpan:regionSpan.span]};
    MKPlacemark *placemark = [[MKPlacemark alloc] initWithCoordinate:coordGCJ addressDictionary:nil];
    MKMapItem *mapItem = [[MKMapItem alloc] initWithPlacemark:placemark];
    mapItem.name = name;
    [mapItem openInMapsWithLaunchOptions:options];
}
  • 各类坐标转换：
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const double pi = 3.14159265358979324;
const double x_pi = pi * 3000.0 / 180.0;
const double a = 6378245.0;
const double ee = 0.00669342162296594323;

+ (void)bdLat:(double)bd_lat Lon:(double)bd_lon toAMapLat:(double *)gg_lat aMaplng:(double *)gg_lon {
    double x = bd_lon - 0.0065, y = bd_lat - 0.006;
    double z = sqrt(x * x + y * y) - 0.00002 * sin(y * x_pi);
    double theta = atan2(y, x) - 0.000003 * cos(x * x_pi);
    *gg_lon = z * cos(theta);
    *gg_lat = z * sin(theta);
}

/**
 *  将 WGS 的经纬度（GPS）转成 GCJ 的经纬度（比如高德）
 *
 *  @param wgsLoc wgs 经纬度
 *
 *  @return GCJ 经纬度
 */
+ (CLLocationCoordinate2D)transformFromWGSToGCJ:(CLLocationCoordinate2D)wgsLoc {
    CLLocationCoordinate2D adjustLoc;
    
    if ([self isLocationOutOfChina:wgsLoc]){
        adjustLoc = wgsLoc;
    } else {
        double adjustLat = [self transformLatWithX:wgsLoc.longitude - 105.0 withY:wgsLoc.latitude - 35.0];
        double adjustLon = [self transformLonWithX:wgsLoc.longitude - 105.0 withY:wgsLoc.latitude - 35.0];
        double radLat = wgsLoc.latitude / 180.0 * pi;
        double magic = sin(radLat);
        magic = 1 - ee * magic * magic;
        double sqrtMagic = sqrt(magic);
        adjustLat = (adjustLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
        adjustLon = (adjustLon * 180.0) / (a / sqrtMagic * cos(radLat) * pi);
        adjustLoc.latitude = wgsLoc.latitude + adjustLat;
        adjustLoc.longitude = wgsLoc.longitude + adjustLon;
    }
    
    return adjustLoc;
}

/**
 *  判断经纬度是否在中国
 *
 *  @param location  经纬度
 *
 *  @return 是否在中国
 */
+ (BOOL)isLocationOutOfChina:(CLLocationCoordinate2D)location {
    if (location.longitude < 72.004 || location.longitude > 137.8347 || location.latitude < 0.8293 || location.latitude > 55.8271)
        return YES;
    return NO;
}

+ (double)transformLatWithX:(double)x withY:(double)y {
    double lat = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * sqrt(fabs(x));
    lat += (20.0 * sin(6.0 * x * pi) + 20.0 *sin(2.0 * x * pi)) * 2.0 / 3.0;
    lat += (20.0 * sin(y * pi) + 40.0 * sin(y / 3.0 * pi)) * 2.0 / 3.0;
    lat += (160.0 * sin(y / 12.0 * pi) + 320 * sin(y * pi / 30.0)) * 2.0 / 3.0;
    
    return lat;
}

+ (double)transformLonWithX:(double)x withY:(double)y {
    double lon = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * sqrt(fabs(x));
    lon += (20.0 * sin(6.0 * x * pi) + 20.0 * sin(2.0 * x * pi)) * 2.0 / 3.0;
    lon += (20.0 * sin(x * pi) + 40.0 * sin(x / 3.0 * pi)) * 2.0 / 3.0;
    lon += (150.0 * sin(x / 12.0 * pi) + 300.0 * sin(x / 30.0 * pi)) * 2.0 / 3.0;
    
    return lon;
}

/**
 *  GJC 经纬度（比如高德）转成 WGS 经纬度（GPS）
 *
 *  @param location GJC 经纬度
 *
 *  @return WGS 经纬度
 */
+ (CLLocationCoordinate2D)transformFromGCJ02ToWGS84:(CLLocationCoordinate2D)location {
    return [self gcj02Decrypt:location.latitude gjLon:location.longitude];
}

+ (CLLocationCoordinate2D)gcj02Decrypt:(double)gjLat gjLon:(double)gjLon {
    CLLocationCoordinate2D  gPt = [self gcj02Encrypt:gjLat bdLon:gjLon];
    double dLon = gPt.longitude - gjLon;
    double dLat = gPt.latitude - gjLat;
    CLLocationCoordinate2D pt;
    pt.latitude = gjLat - dLat;
    pt.longitude = gjLon - dLon;
    return pt;
}

+ (CLLocationCoordinate2D)gcj02Encrypt:(double)ggLat bdLon:(double)ggLon {
    CLLocationCoordinate2D resPoint;
    double mgLat;
    double mgLon;
    if ([self isLocationOutOfChina:CLLocationCoordinate2DMake(ggLat, ggLon)]) {
        resPoint.latitude = ggLat;
        resPoint.longitude = ggLon;
        return resPoint;
    }
    
    double dLat = [self transformLatWithX:(ggLon - 105.0) withY:(ggLat - 35.0)];
    double dLon = [self transformLonWithX:(ggLon - 105.0) withY:(ggLat - 35.0)];
    double radLat = ggLat / 180.0 * M_PI;
    double magic = sin(radLat);
    magic = 1 - ee * magic * magic;
    double sqrtMagic = sqrt(magic);
    dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * M_PI);
    dLon = (dLon * 180.0) / (a / sqrtMagic * cos(radLat) * M_PI);
    mgLat = ggLat + dLat;
    mgLon = ggLon + dLon;
    
    resPoint.latitude = mgLat;
    resPoint.longitude = mgLon;
    return resPoint;
}

0x0103 字符串

  • 将对象转成字符串，可以防止 NSNull 对象：
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+ (NSString *)stringWithObject:(id)object {
    if ((NSNull *)object == [NSNull null]) {
        return @"";
    }
    
    if ([object isKindOfClass:[NSString class]]) {
        return object;
    } else if (object) {
        return [NSString stringWithFormat:@"%@", object];
    } else {
        return @"";
    }
}
  • 随机字符串：
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static NSString *const letters = @"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";

+ (NSString *)randomLettersWithCount:(NSUInteger)count {
    NSMutableString *string = @"".mutableCopy;
    for (int i = 0; i < count; i++) {
        uint32_t random = arc4random_uniform(letters.length);
        [string appendString:[letters substringWithRange:NSMakeRange(random, 1)]];
    }
    
    return [string copy];
}
  • 给文字添加行间距：
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+ (NSAttributedString *)attributedStringWithText:(NSString *)text lineSpacing:(CGFloat)lineSpacing font:(UIFont *)font textColor:(UIColor *)textColor {
    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
    paragraphStyle.lineSpacing = lineSpacing;
    
    NSDictionary *attrsDictionary = @{NSFontAttributeName : font, NSForegroundColorAttributeName : textColor, NSParagraphStyleAttributeName : paragraphStyle};
    NSAttributedString *attributedString =  [[NSAttributedString alloc] initWithString:text attributes:attrsDictionary];
    
    return attributedString;
}

0x0104 图片

公共方法：

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+ (UIImage *)createNonInterpolatedUIImageFromCIImage:(CIImage *)image withScale:(CGFloat)scale {
    // Render the CIImage into a CGImage
    CGImageRef cgImage = [[CIContext contextWithOptions:nil] createCGImage:image fromRect:image.extent];
    // Now we'll rescale using CoreGraphics
    UIGraphicsBeginImageContext(CGSizeMake(image.extent.size.width * scale, image.extent.size.width * scale));
    CGContextRef context = UIGraphicsGetCurrentContext();
    // We don't want to interpolate (since we've got a pixel-correct image)
    CGContextSetInterpolationQuality(context, kCGInterpolationNone);
    CGContextDrawImage(context, CGContextGetClipBoundingBox(context), cgImage);
    // Get the image out
    UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext();
    // Tidy up
    UIGraphicsEndImageContext();
    CGImageRelease(cgImage);
    
    return scaledImage;
}
  • 生成二维码：
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+ (UIImage *)generateQRCodeImageWithString:(NSString *)qrString scale:(CGFloat)scale color:(UIColor *)color backgroundColor:(UIColor *)backgroundColor {
    CIFilter *qrFilter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
    if (!qrFilter) {
        NSLog(@"Error: Could not load filter");
        return nil;
    }
    
    NSData *stringData = [qrString dataUsingEncoding:NSUTF8StringEncoding]; // NSISOLatin1StringEncoding
    [qrFilter setValue:stringData forKey:@"inputMessage"];
    
    CIFilter *colorQRFilter = [CIFilter filterWithName:@"CIFalseColor"];
    [colorQRFilter setValue:qrFilter.outputImage forKey:@"inputImage"];
    
    // 二维码颜色
    if (color == nil) {
        color = [UIColor blackColor];
    }
    
    if (backgroundColor == nil) {
        backgroundColor = [UIColor whiteColor];
    }
    
    [colorQRFilter setValue:[CIColor colorWithCGColor:color.CGColor] forKey:@"inputColor0"];
    // 背景颜色
    [colorQRFilter setValue:[CIColor colorWithCGColor:backgroundColor.CGColor] forKey:@"inputColor1"];
    
    CIImage *ciImage = colorQRFilter.outputImage;
    
    UIImage *qrCodeImage = [self createNonInterpolatedUIImageFromCIImage:ciImage withScale:scale * [UIScreen mainScreen].scale];
    
    return qrCodeImage;
}
  • 生成条形码：
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+ (UIImage *)generateBarcodeImageWithString:(NSString *)codeString scale:(CGFloat)scale color:(UIColor *)color backgroundColor:(UIColor *)backgroundColor {
    CIFilter *filter = [CIFilter filterWithName:@"CICode128BarcodeGenerator"];
    if (!filter) {
        NSLog(@"Error: Could not load filter");
        return nil;
    }
    
    NSData *data = [codeString dataUsingEncoding:NSISOLatin1StringEncoding allowLossyConversion:false];
    [filter setValue:data forKey:@"inputMessage"];
    
    CIFilter * colorFilter = [CIFilter filterWithName:@"CIFalseColor"];
    [colorFilter setValue:filter.outputImage forKey:@"inputImage"];
    
    // 条形码颜色
    if (color == nil) {
        color = [UIColor blackColor];
    }
    
    if (backgroundColor == nil) {
        backgroundColor = [UIColor whiteColor];
    }
    
    [colorFilter setValue:[CIColor colorWithCGColor:color.CGColor] forKey:@"inputColor0"];
    // 背景颜色
    [colorFilter setValue:[CIColor colorWithCGColor:backgroundColor.CGColor] forKey:@"inputColor1"];
    
    CIImage *ciImage = colorFilter.outputImage;
    
    UIImage *barCodeImage = [self createNonInterpolatedUIImageFromCIImage:ciImage withScale:scale * [UIScreen mainScreen].scale];
    
    return barCodeImage;
}
  • UIView 转 UIImage：
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+ (UIImage *)renderImageFromView:(UIView *)view withRect:(CGRect)frame transparentInsets:(UIEdgeInsets)insets {
    CGSize imageSizeWithBorder = CGSizeMake(frame.size.width + insets.left + insets.right, frame.size.height + insets.top + insets.bottom);
    // Create a new context of the desired size to render the image
    UIGraphicsBeginImageContextWithOptions(imageSizeWithBorder, NO, 0);
    CGContextRef context = UIGraphicsGetCurrentContext();
    
    // Clip the context to the portion of the view we will draw
    CGContextClipToRect(context, (CGRect){{insets.left, insets.top}, frame.size});
    // Translate it, to the desired position
    CGContextTranslateCTM(context, -frame.origin.x + insets.left, -frame.origin.y + insets.top);
    
    // Render the view as image
    [view.layer renderInContext:UIGraphicsGetCurrentContext()];
    
    // Fetch the image
    UIImage *renderedImage = UIGraphicsGetImageFromCurrentImageContext();
    
    // Cleanup
    UIGraphicsEndImageContext();
    
    return renderedImage;
}
  • UIColor 转 UIImage：
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+ (UIImage *)imageWithColor:(UIColor *)aColor {
    return [UIImage imageWithColor:aColor withFrame:CGRectMake(0, 0, 1, 1)];
}

+ (UIImage *)imageWithColor:(UIColor *)aColor withFrame:(CGRect)aFrame {
    UIGraphicsBeginImageContext(aFrame.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetFillColorWithColor(context, [aColor CGColor]);
    CGContextFillRect(context, aFrame);
    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return img;
}

0x0105 其他

  • 按照给定的总数和每列的个数计算行数：
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+ (NSInteger)rowsWithCount:(NSInteger)count colNumber:(NSInteger)colNumber {
    NSInteger rows = ceilf(count / (CGFloat)colNumber);
    return rows;
}
  • 将数字转成中文大写金额：
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static NSArray<NSString *> *chineseDigits;

+ (NSString *)stringFromMoney:(CGFloat)amount {
    if (!chineseDigits) {
        chineseDigits = @[@"零", @"壹", @"贰", @"叁", @"肆", @"伍", @"陆", @"柒", @"捌", @"玖"];
    }
    
    if (amount > 99999999999999.99 || amount < -99999999999999.99) {
        NSAssert(YES, @"参数值超出允许范围 (-99999999999999.99 ～ 99999999999999.99)！");
    }
    
    bool negative = false;
    if (amount < 0) {
        negative = true;
        amount = amount * (-1);
    }
    
    long temp = round(amount * 100);
    int numFen = (int)(temp % 10); // 分
    temp = temp / 10;
    int numJiao = (int)(temp % 10); //角
    temp = temp / 10;
    // temp 目前是金额的整数部分
    
    NSMutableArray *parts = [NSMutableArray arrayWithCapacity:20]; // 其中的元素是把原来金额整数部分分割为值在 0~9999 之间的数的各个部分
    int numParts = 0; // 记录把原来金额整数部分分割为了几个部分（每部分都在 0~9999 之间）
    for (int i = 0; ; i++) {
        if (temp == 0) { break; }
        
        int part = (int)(temp % 10000);
        parts[i] = @(part);
        numParts++;
        temp = temp / 10000;
    }
    
    bool beforeWanIsZero = true; // 标志“万”下面一级是不是 0
    
    NSString *chineseStr = @"";
    for (int i = 0; i < numParts; i++) {
        NSString *partChinese = [MLBUtilities partTranslate:[parts[i] intValue]];
        if (i % 2 == 0) {
            if (IsStringEmpty(partChinese)) {
                beforeWanIsZero = true;
            } else {
                beforeWanIsZero = false;
            }
        }
        
        if (i != 0) {
            if (i % 2 == 0) {
                chineseStr = [@"亿" stringByAppendingString:chineseStr];
            } else {
                if (IsStringEmpty(partChinese) && !beforeWanIsZero) { // 如果“万”对应的 part 为 0，而“万”下面一级不为 0，则不加“万”，而加“零”
                    chineseStr = [@"零" stringByAppendingString:chineseStr];
                } else {
                    if ([parts[i-1] intValue] < 1000 && [parts[i-1] intValue] > 0) { // 如果"万"的部分不为 0, 而"万"前面的部分小于 1000 大于 0， 则万后面应该跟“零”
                        chineseStr = [@"零" stringByAppendingString:chineseStr];
                    }
                    
                    chineseStr = [@"万" stringByAppendingString:chineseStr];
                }
            }
        }
        
        chineseStr = [partChinese stringByAppendingString:chineseStr];
    }
    
    if (IsStringEmpty(chineseStr)) { // 整数部分为 0, 则表达为"零元"
        chineseStr = chineseDigits[0];
    } else if (negative) { // 整数部分不为 0, 并且原金额为负数
        chineseStr = [@"负" stringByAppendingString:chineseStr];
    }
    
    chineseStr = [chineseStr stringByAppendingString:@"元"];
    
    if (numFen == 0 && numJiao == 0) {
        chineseStr = [chineseStr stringByAppendingString:@"整"];
    } else if (numFen == 0) { // 0 分，角数不为 0
        chineseStr = [NSString stringWithFormat:@"%@%@%@", chineseStr, chineseDigits[numJiao], @"角"];
    } else { // “分”数不为 0
        if (numJiao == 0) {
            chineseStr = [NSString stringWithFormat:@"%@%@%@%@", chineseStr, @"零", chineseDigits[numFen], @"分"];
        } else {
            chineseStr = [NSString stringWithFormat:@"%@%@%@%@%@", chineseStr, chineseDigits[numJiao], @"角", chineseDigits[numFen], @"分"];
        }
    }
    
    return chineseStr;
}

+ (NSString *)partTranslate:(int)amountPart {
    if (amountPart < 0 || amountPart > 10000) {
        NSAssert(YES, @"参数必须是大于等于 0，小于 10000 的整数！");
    }
    
    NSArray *units = @[@"", @"拾", @"佰", @"仟"];
    
    int temp = amountPart;
    
    NSString *amountStr = [@(amountPart) stringValue];
    int amountStrLength = (int)amountStr.length;
    bool lastIsZero = true; //在从低位往高位循环时，记录上一位数字是不是 0
    NSString *chineseStr = @"";
    
    for (int i = 0; i < amountStrLength; i++) {
        if (temp == 0) { break; } // 高位已无数据
        
        int digit = temp % 10;
        if (digit == 0) { // 取到的数字为 0
            if (!lastIsZero) { //前一个数字不是 0，则在当前汉字串前加“零”字;
                chineseStr = [@"零" stringByAppendingString:chineseStr];
            }
            
            lastIsZero = true;
        } else { // 取到的数字不是 0
            chineseStr = [NSString stringWithFormat:@"%@%@%@", chineseDigits[digit], units[i], chineseStr];
            lastIsZero = false;
        }
        
        temp = temp / 10;
    }
    
    return chineseStr;
}

0x02 其他

  • 火星坐标系 (GCJ-02) 与百度坐标系 (BD-09) 的转换

算法代码如下，其中 bd_encrypt 将 GCJ-02 坐标转换成 BD-09 坐标，bd_decrypt 反之。

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#include <math.h>

const double x_pi = 3.14159265358979324 * 3000.0 / 180.0;

void bd_encrypt(double gg_lat, double gg_lon, double &bd_lat, double &bd_lon)
{
    double x = gg_lon, y = gg_lat;
    double z = sqrt(x * x + y * y) + 0.00002 * sin(y * x_pi);
    double theta = atan2(y, x) + 0.000003 * cos(x * x_pi);
    bd_lon = z * cos(theta) + 0.0065;
    bd_lat = z * sin(theta) + 0.006;
}

void bd_decrypt(double bd_lat, double bd_lon, double &gg_lat, double &gg_lon)
{
    double x = bd_lon - 0.0065, y = bd_lat - 0.006;
    double z = sqrt(x * x + y * y) - 0.00002 * sin(y * x_pi);
    double theta = atan2(y, x) - 0.000003 * cos(x * x_pi);
    gg_lon = z * cos(theta);
    gg_lat = z * sin(theta);
}

原博客地址
这篇博文是通过 SegmentFault 上的 这篇文章 找到的。

  • 日期转换格式
    iOS NSDateFormatter 格式说明：
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G: 公元时代，例如AD公元
yy: 年的后2位
yyyy: 完整年
MM: 月，显示为1-12
MMM: 月，显示为英文月份简写,如 Jan
MMMM: 月，显示为英文月份全称，如 Janualy
dd: 日，2位数表示，如02
d: 日，1-2位显示，如 2
EEE: 简写星期几，如Sun
EEEE: 全写星期几，如Sunday
aa: 上下午，AM/PM
H: 时，24小时制，0-23
K：时，12小时制，0-11
m: 分，1-2位
mm: 分，2位
s: 秒，1-2位
ss: 秒，2位
S: 毫秒
Z：GMT

常用的时间格式有：

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yyyy-MM-dd HH:mm:ss.SSS
yyyy-MM-dd HH:mm:ss
yyyy-MM-dd
MM dd yyyy

原博客地址