【移动开发】样式文本_NSMutableAttributedString

有时可能会遇到这样的问题，一个label中设置的文本含有2种以上不同的格式，又不能把它拆解为两个label来显示，这时用NSMutableAttributedString可以很好的解决问题。

- (IBAction)buttonPressed:(UIButton *)sender {
    NSString *title = [sender titleForState:UIControlStateNormal];
    NSString *plainText = [NSString stringWithFormat:@"%@ button pressed.", title];
//    statusLabel.text = plainText;

    NSMutableAttributedString *styledText = [[NSMutableAttributedString alloc]
                                             initWithString:plainText];
    
    NSDictionary *attributes = @{
    NSFontAttributeName : [UIFont boldSystemFontOfSize:statusLabel.font.pointSize]
    };

    NSRange nameRange = [plainText rangeOfString:title];
    
    [styledText setAttributes:attributes
                        range:nameRange];
    statusLabel.attributedText = styledText;
}

    NSMutableAttributedString *text = [[NSMutableAttributedString alloc]
                                       initWithAttributedString: label.attributedText];
    [text addAttribute: NSForegroundColorAttributeName value:[UIColor redColor]
                 range: NSMakeRange(10, 1)];
    [label setAttributedText: text];

官方指南

https://developer.apple.com/library/ios/documentation/Cocoa/Reference/Foundation/Classes/NSMutableAttributedString_Class/