iOS_Tool工具类实用方法归纳

记在前面：以前做金融类的APP开发，有封装了一套浮点类数据的处理，比如添加分隔符：10000>>10,000。更多处理单独放一篇文章（我就是传送门）

1.字符串字节长度（包括中英文混合）

+(NSUInteger)stringByteLength:(NSString *)text {
    int strlength = 0;
    char *p = (char *)[text cStringUsingEncoding:NSUnicodeStringEncoding];
    for (int i=0; i < [text lengthOfBytesUsingEncoding:NSUnicodeStringEncoding]; i++) {
        if (*p) {
            p++;
            strlength++;
        }
        else {
            p++;
        }
    }
    return strlength;
}

2.正则表达式（限制只能输入数字、字母、汉字）

+ (BOOL)isQualifiedString:(NSString *)string {
    NSString *codeRegex = @"^[0-9a-zA-Z\u4e00-\u9fa5]*$";
    NSPredicate *codeTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",codeRegex];
    return [codeTest evaluateWithObject:string];
}

3.正则表达式（身份证验证）

+ (BOOL)isIDCard:(NSString *)idCard{
    NSString *codeRegex = @"^([0-9]{17}[0-9Xx]{1})|([0-9]{15})$";
    NSPredicate *codeTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",codeRegex];
    return [codeTest evaluateWithObject:idCard];
}

4.时间戳转换成几分钟前的格式

+ (NSString *)transformMinutesAgoTimestamp:(NSInteger)timestamp{
    
    NSDateFormatter *dateFormtter =[[NSDateFormatter alloc] init];
    NSDate *d = [NSDate dateWithTimeIntervalSince1970:timestamp];
    NSTimeInterval late=[d timeIntervalSince1970]*1;    //转记录的时间戳
    NSDate* dat = [NSDate dateWithTimeIntervalSinceNow:0];
    NSTimeInterval now=[dat timeIntervalSince1970]*1;   //获取当前时间戳
    NSString *timeString=@"";
    NSTimeInterval cha=now-late;
    // 发表在一小时之内
    if (cha/3600<1) {
        if (cha/60<1) {
            timeString = @"1";
        }
        else
        {
            timeString = [NSString stringWithFormat:@"%f", cha/60];
            timeString = [timeString substringToIndex:timeString.length-7];
        }
        
        timeString=[NSString stringWithFormat:@"%@分钟前", timeString];
    }
    // 在一小时以上24小以内
    else if (cha/3600>1&&cha/86400<1) {
        timeString = [NSString stringWithFormat:@"%f", cha/3600];
        timeString = [timeString substringToIndex:timeString.length-7];
        timeString=[NSString stringWithFormat:@"%@小时前", timeString];
    }
    // 发表在24以上10天以内
    else if (cha/86400>1&&cha/86400*3<1)     //86400 = 60(分)*60(秒)*24(小时)   3天内
    {
        timeString = [NSString stringWithFormat:@"%f", cha/86400];
        timeString = [timeString substringToIndex:timeString.length-7];
        timeString=[NSString stringWithFormat:@"%@天前", timeString];
    }
    // 发表时间大于10天
    else
    {
        [dateFormtter setDateFormat:@"yyyy/MM/dd"];
        timeString = [dateFormtter stringFromDate:d];
    }
    
    return timeString;
}

5.生成二维码

+ (UIImage *)createQRUIImageFormUrl:(NSString *)qrString withSize:(CGFloat) size {
    
    NSData *stringData = [qrString dataUsingEncoding:NSUTF8StringEncoding];
    // 创建filter
    CIFilter *qrFilter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
    // 设置内容和纠错级别
    [qrFilter setValue:stringData forKey:@"inputMessage"];
    [qrFilter setValue:@"M" forKey:@"inputCorrectionLevel"];
    CIImage *image = qrFilter.outputImage;
    
    CGRect extent = CGRectIntegral(image.extent);
    CGFloat scale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent));
    // 创建bitmap;
    size_t width = CGRectGetWidth(extent) * scale;
    size_t height = CGRectGetHeight(extent) * scale;
    CGColorSpaceRef cs = CGColorSpaceCreateDeviceGray();
    CGContextRef bitmapRef = CGBitmapContextCreate(nil, width, height, 8, 0, cs, (CGBitmapInfo)kCGImageAlphaNone);
    CIContext *context = [CIContext contextWithOptions:nil];
    CGImageRef bitmapImage = [context createCGImage:image fromRect:extent];
    CGContextSetInterpolationQuality(bitmapRef, kCGInterpolationNone);
    CGContextScaleCTM(bitmapRef, scale, scale);
    CGContextDrawImage(bitmapRef, extent, bitmapImage);
    // 保存bitmap到图片
    CGImageRef scaledImage = CGBitmapContextCreateImage(bitmapRef);
    CGContextRelease(bitmapRef);
    CGImageRelease(bitmapImage);
    return [UIImage imageWithCGImage:scaledImage];
}

6.UIColor转UIImage

+ (UIImage *)imageWithColor:(UIColor *)color {
    CGRect rect = CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);
    UIGraphicsBeginImageContext(rect.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    
    CGContextSetFillColorWithColor(context, [color CGColor]);
    CGContextFillRect(context, rect);
    
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    return image;
}

7.UIView转UIImage

+ (UIImage *)getImageFromView:(UIView *)view size:(CGSize)size {
    UIGraphicsBeginImageContextWithOptions(size, NO, 0);
    [view.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}

8.创建渐变UIImage

/**
 *  生成渐变UIImage
 *  @param  startColor      开始颜色
 *  @param  endColor        结束颜色
 *  @param  size            生成Image的大小
 *  @param  isHorizontal    水平/垂直方向
 *  @param  cornerRadius    圆角量
 */
+ (UIImage *)getGradientImageStartColor:(UIColor *)startColor
                               endColor:(UIColor *)endColor
                                   size:(CGSize)size
                           isHorizontal:(BOOL)isHorizontal
                           cornerRadius:(CGFloat)cornerRadius {
    
    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, size.width, size.height)];

    CAGradientLayer *gradientLayer = [CAGradientLayer layer];
    gradientLayer.colors = @[(__bridge id)startColor.CGColor, (__bridge id)endColor.CGColor];
    gradientLayer.locations = @[@0.0, @1.0];
    gradientLayer.startPoint = CGPointMake(0, 0);
    gradientLayer.endPoint = isHorizontal?CGPointMake(1, 0):CGPointMake(0, 1.0);
    gradientLayer.frame = CGRectMake(0, 0, size.width, size.height);
    gradientLayer.masksToBounds = YES;
    gradientLayer.cornerRadius = cornerRadius;
    
    [view.layer addSublayer:gradientLayer];
    
    UIGraphicsBeginImageContextWithOptions(view.size, NO, 0);
    [view.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image;
}

9.绘制虚线

+ (UIView *)initDottedLineRect:(CGRect)rect lineSpace:(int)space lineWidth:(int)width{
    UIView *line = [[UIView alloc] initWithFrame:rect];
    
    CAShapeLayer *shapeLayer = [CAShapeLayer layer];
    [shapeLayer setBounds:line.bounds];
    [shapeLayer setPosition:CGPointMake(CGRectGetWidth(line.frame) / 2, CGRectGetHeight(line.frame))];
    [shapeLayer setFillColor:[UIColor clearColor].CGColor];
    //  设置虚线颜色为blackColor
    [shapeLayer setStrokeColor:NormColor_LineGray.CGColor];
    //  设置虚线宽度
    [shapeLayer setLineWidth:CGRectGetHeight(line.frame)];
    [shapeLayer setLineJoin:kCALineJoinRound];
    //  设置线宽，线间距
    [shapeLayer setLineDashPattern:[NSArray arrayWithObjects:[NSNumber numberWithInt:width], [NSNumber numberWithInt:space], nil]];
    //  设置路径
    CGMutablePathRef path = CGPathCreateMutable();
    CGPathMoveToPoint(path, NULL, 0, 0);
    CGPathAddLineToPoint(path, NULL, CGRectGetWidth(line.frame), 0);
    [shapeLayer setPath:path];
    CGPathRelease(path);
    //  把绘制好的虚线添加上来
    [line.layer addSublayer:shapeLayer];
    return line;
}

10.字符串是否为空

+ (BOOL)isEmptyString:(NSString *)string{
    if (string == nil || string == NULL) {
        return YES;
    }
    if ([string isKindOfClass:[NSNull class]]) {
        return YES;
    }
    if (![string isKindOfClass:[NSString class]]) {
        return YES;
    }
    if ([[string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]] length]==0) {
        return YES;
    }
    if ([string isEqualToString:@""]) {
        return YES;
    }
    return NO;
}

11.获取APP当前版本号

+ (NSString *)appCurrentVersion {
    NSDictionary* infoDict =[[NSBundle mainBundle] infoDictionary];
    NSString *appVersion = [infoDict valueForKey:@"CFBundleShortVersionString"];
    return appVersion;
}

12.手机号添加空格

+ (NSString *)addSpaceForPhone:(NSString *)phone {
    if ([phone isKindOfClass:[NSString class]]) {

        phone = [phone stringByReplacingOccurrencesOfString:@" " withString:@""];
        
        NSMutableString * str = [[NSMutableString alloc ] initWithString:phone];
        
        if (phone.length >= 8) {
            [str insertString:@" " atIndex:7];
        }
        if (phone.length >= 4) {
            [str insertString:@" " atIndex:3];
        }
        if (str.length > 13 ) {
            return [str substringToIndex:13];
        }
        return str;
    }
    return @"";
}

13.获取当前控制器

+ (UIViewController *)getCurrentController {

    UIWindow *window = [[[UIApplication sharedApplication] delegate] window];
    UIViewController* currentViewController = window.rootViewController;
    BOOL runLoopFind = YES;
    while (runLoopFind) {
        if (currentViewController.presentedViewController) {
            currentViewController = currentViewController.presentedViewController;
        } else if ([currentViewController isKindOfClass:[UINavigationController class]]) {
            UINavigationController* navigationController = (UINavigationController* )currentViewController;
            currentViewController = [navigationController.childViewControllers lastObject];
        } else if ([currentViewController isKindOfClass:[UITabBarController class]]) {
            UITabBarController* tabBarController = (UITabBarController* )currentViewController;
            currentViewController = tabBarController.selectedViewController;
        } else {
            NSUInteger childViewControllerCount = currentViewController.childViewControllers.count;
            if (childViewControllerCount > 0) {
                currentViewController = currentViewController.childViewControllers.lastObject;
                // 如果有addChildViewController的话，需要过滤子控制器，否则pop到子控制器会崩溃
                if ([currentViewController isKindOfClass:[XXXXViewController class]]) {
                    currentViewController = currentViewController.parentViewController;
                }
                return currentViewController;
            } else {
                // 如果有addChildViewController的话，需要过滤子控制器，否则pop到子控制器会崩溃
                if ([currentViewController isKindOfClass:[XXXXViewController class]]) {
                    currentViewController = currentViewController.parentViewController;
                }
                return currentViewController;
            }
        }
    }
    return currentViewController;
}