[Code Note] iOS-converts the specific characters in the string to red, ios-string
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-(Void) viewDidLoad {[super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. UILabel * testLabel = [[UILabel alloc] initWithFrame: CGRectMake (10,100,100, 50)]; testLabel. text = @ "1234567890"; testLabel. backgroundColor = [UIColor orangeColor]; [self. view addSubview: testLabel]; [self redXingWithLabel: testLabel atIndex: 2];} // converts a specific character in the string to red-(void) redXingWithLabel :( UILabel *) tempLabel atIndex :( NSInteger) tempIndex {NSMutableAttributedString * tempString = [[NSMutableAttributedString alloc] initWithString: tempLabel. text]; [tempString addattriabel: NSForegroundColorAttributeName value: [UIColor redColor] range: NSMakeRange (tempIndex, 1)]; tempLabel. attributedText = tempString ;}