十六进制string转换UIColor －备用

- (UIColor *) colorWithHexString: (NSString *) stringToConvert

{

NSString *cString = [[stringToConvert stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];//字符串处理

//例子，stringToConvert #ffffff

if ([cString length] < 6)

return DEFAULT_VOID_COLOR;//如果非十六进制，返回白色

if ([cString hasPrefix:@"#"])

cString = [cString substringFromIndex:1];//去掉头

if ([cString length] != 6)//去头非十六进制，返回白色

return DEFAULT_VOID_COLOR;

//分别取RGB的值

NSRange range;

range.location = 0;

range.length = 2;

NSString *rString = [cString substringWithRange:range];

range.location = 2;

NSString *gString = [cString substringWithRange:range];

range.location = 4;

NSString *bString = [cString substringWithRange:range];

unsigned int r, g, b;

//NSScanner把扫描出的制定的字符串转换成Int类型

[[NSScanner scannerWithString:rString] scanHexInt:&r];

[[NSScanner scannerWithString:gString] scanHexInt:&g];

[[NSScanner scannerWithString:bString] scanHexInt:&b];

//转换为UIColor

return [UIColor colorWithRed:((float) r / 255.0f)

green:((float) g / 255.0f)

blue:((float) b / 255.0f)

alpha:1.0f];

}