IOS：16进制代码转UIColor对象

 1 //把16进制转为UIcolor对象的代码
 2 - (UIColor *) colorWithHexString: (NSString *) stringToConvert
 3 {
 4     NSString *cString = [[stringToConvert stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]uppercaseString];//字符串处理
 5     //例子，stringToConvert #ffffff
 6     if ([cString length] <6)
 7         return [UIColor clearColor];//如果非十六进制，返回白色
 8     if ([cString hasPrefix:@"#"])
 9         cString = [cString substringFromIndex:1];//去掉头
10     if ([cString length] !=6)//去头非十六进制，返回白色
11         return [UIColor clearColor];
12     //分别取RGB的值
13     NSRange range;
14     range.location =0;
15     range.length =2;
16     NSString *rString = [cString substringWithRange:range];
17     range.location =2;
18     NSString *gString = [cString substringWithRange:range];
19     range.location =4;
20     NSString *bString = [cString substringWithRange:range];
21     unsigned int r, g, b;
22     //NSScanner把扫描出的制定的字符串转换成Int类型
23     [[NSScanner scannerWithString:rString] scanHexInt:&r];
24     [[NSScanner scannerWithString:gString] scanHexInt:&g];
25     [[NSScanner scannerWithString:bString] scanHexInt:&b];
26     //转换为UIColor
27     return [UIColor colorWithRed:((float) r /255.0f)
28                            green:((float) g /255.0f)
29                             blue:((float) b /255.0f)
30                            alpha:1.0f];
31 
32 }