UIColor轉換以及簡單擴充

概述

UIColor

也是我們開發中必然會用到的内容，這裡簡單的歸類了一些常用功能:

• hexString

  轉到

  UIColor

• 從

  PatternImage

  擷取

  UIColor

• UIColor

  轉換成圖檔

這裡建立了分類

UIColor+MMAddition.{h,m}

來簡單的總結上述幾個點

檔案代碼UIColor+MMAddition.{h,m}下載下傳直接使用

下面也是全部代碼的介紹,可以Ctrl+C使用

API

1、+ (UIColor )colorWithHexString:(NSString )hexString

通過16進制hexString色值直接擷取

UIColor

對象

+ (UIColor *)colorWithHexString:(NSString *)hexString {

    return [self colorWithHexString:hexString alpha:f];
}

+ (UIColor *)colorWithHexString:(NSString *)hexString alpha:(CGFloat)alpha {

    NSString *cString = [[hexString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];

    if ([cString length] < )
        return nil;
    if ([cString hasPrefix:@"#"])
        cString = [cString substringFromIndex:];
    if ([cString length] != )
        return nil;

    NSString *rString = [cString substringWithRange:NSMakeRange(, )];
    NSString *gString = [cString substringWithRange:NSMakeRange(, )];
    NSString *bString = [cString substringWithRange:NSMakeRange(, )];


    unsigned int r, g, b;
    [[NSScanner scannerWithString:rString] scanHexInt:&r];
    [[NSScanner scannerWithString:gString] scanHexInt:&g];
    [[NSScanner scannerWithString:bString] scanHexInt:&b];

    UIColor *hexColor = [UIColor colorWithRed:((float) r / f)
                                        green:((float) g / f)
                                         blue:((float) b / f)
                                        alpha:alpha];

    return hexColor;
}
           

2、+ (UIColor )colorWithUIImage:(UIImage )image

從一張純色圖擷取顔色

+ (UIColor *)colorWithUIImage:(UIImage *)image {
    return [self colorWithPatternImage:image];
}

           

3、+ (UIImage )imageWithColor:(UIColor )color

由

UIColor

顔色擷取

UIImage

對象

+ (UIImage *)imageWithColor:(UIColor *)color {

    CGRect rect = CGRectMake(f, f, f, f);
    UIGraphicsBeginImageContext(rect.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetFillColorWithColor(context, [color CGColor]);
    CGContextFillRect(context, rect);
    UIImage *theImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return theImage;
}
           

4、+ (UIImage )imageWithHexString:(NSString )hexString

由16進制

HexString

顔色擷取

UIImage

對象

+ (UIImage *)imageWithHexString:(NSString *)hexString {
    return [self imageWithColor:[self colorWithHexString:hexString]];
}

           

PS:以上部分代碼需要配套使用