iOS开发-16进制颜色转换

项目中经常会用到颜色转换，有的是通过十六进制转成数字转颜色，想简单的点直接通过字符串转一下，简单扩展了一下分类UIColor，代码如下:

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+(UIColor *)colorWithHex:(NSString *)hexColor{     return [self colorWithHex:hexColor alpha:1.0f]; } //http://www.cnblogs.com/xiaofeixiang  iOS技术交流:228407086 +(UIColor *)colorWithHex:(NSString *)hexColor alpha:(float)alpha{     //删除空格     NSString *colorStr = [[hexColor stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];     // String should be 6 or 8 characters     if ([colorStr length] < 6||[colorStr length]>7)     {         return [UIColor clearColor];     }     //     if ([colorStr hasPrefix:@"#"])     {         colorStr = [colorStr substringFromIndex:1];     }       NSRange range;     range.location = 0;     range.length = 2;     //red     NSString *redString = [colorStr substringWithRange:range];     //green     range.location = 2;     NSString *greenString = [colorStr substringWithRange:range];     //blue     range.location = 4;     NSString *blueString= [colorStr substringWithRange:range];           // Scan values     unsigned int red, green, blue;     [[NSScanner scannerWithString:redString] scanHexInt:&red];     [[NSScanner scannerWithString:greenString] scanHexInt:&green];     [[NSScanner scannerWithString:blueString] scanHexInt:&blue];     return [UIColor colorWithRed:((float)red/ 255.0f) green:((float)green/ 255.0f) blue:((float)blue/ 255.0f) alpha:alpha]; }

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