iOS 將16進制顏色轉換成UIColor

很多地方我們都使用16進制顏色，但iPhone使用的是UIColor對象，不直接支持16進制顏色，為此，需要我們手動將16進制顏色轉換為UIColor

- (UIColor *) hexStringToColor: (NSString *) stringToConvert
{NSString *cString = [[stringToConvert stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];// String should be 6 or 8 charactersif ([cString length] < 6) return [UIColor blackColor];// strip 0X if it appearsif ([cString hasPrefix:@"0X"]) cString = [cString substringFromIndex:2];if ([cString hasPrefix:@"#"]) cString = [cString substringFromIndex:1];if ([cString length] != 6) return [UIColor blackColor];// 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 valuesunsigned 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];
}

調用方法

backImageView.backgroundColor = [self hexStringToColor: 00afb3];

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