UIColor转换以及简单扩展

UIColor转换以及简单扩展

概述

UIColor也是我们开发中必然会用到的内容，这里简单的归类了一些常用功能:

• hexString转到UIColor
• 从PatternImage获取UIColor
• UIColor转换成图片

这里创建了分类UIColor+MMAddition.{h,m}来简单的总结上述几个点

文件代码UIColor+MMAddition.{h,m}下载直接使用

下面也是全部代码的介绍,可以Ctrl+C使用

API

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

通过16进制hexString色值直接获取UIColor对象

+ (UIColor *)colorWithHexString:(NSString *)hexString {    return [self colorWithHexString:hexString alpha:1.0f];}+ (UIColor *)colorWithHexString:(NSString *)hexString alpha:(CGFloat)alpha {    NSString *cString = [[hexString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];    if ([cString length] < 6)        return nil;    if ([cString hasPrefix:@"#"])        cString = [cString substringFromIndex:1];    if ([cString length] != 6)        return nil;    NSString *rString = [cString substringWithRange:NSMakeRange(0, 2)];    NSString *gString = [cString substringWithRange:NSMakeRange(2, 2)];    NSString *bString = [cString substringWithRange:NSMakeRange(4, 2)];    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 / 255.0f)                                        green:((float) g / 255.0f)                                         blue:((float) b / 255.0f)                                        alpha:alpha];    return hexColor;}

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

从一张纯色图获取颜色

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

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

由UIColor颜色获取UIImage对象

+ (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 *theImage = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    return theImage;}

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

由16进制HexString颜色获取UIImage对象

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

PS:以上部分代码需要配套使用