iOS：自定義顏色作爲UILabel背景顏色

Question

是否有某種方法可以將＃334433分配爲UILabel背景顏色？

預先感謝您。

Answer 1

使用此方法：

- (UIColor *) colorWithHexString: (NSString *) hex 
{ 
    NSString *cString = [[hex stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString]; 

    // String should be 6 or 8 characters 
    if ([cString length] < 6) return [UIColor grayColor]; 

    // strip 0X if it appears 
    if ([cString hasPrefix:@"0X"]) cString = [cString substringFromIndex:2]; 

    if ([cString length] != 6) return [UIColor grayColor]; 

    // Separate into r, g, b substrings 
    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]; 

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

    return [UIColor colorWithRed:((float) r/255.0f) 
         green:((float) g/255.0f) 
         blue:((float) b/255.0f) 
         alpha:1.0f]; 
} 

使用方法如下：

[self colorWithHexString:@"334433"]