第一章

1 #import "ViewController.h" 2  3 @interface ViewController () 4  5 @end 6  7 @implementation ViewController 8  9 10 - (IBAction)buttonPressed:(UIButton *)sender {11     //取出按钮的title12     NSString *title = [sender titleForState:UIControlStateNormal];13     14     //用取出的title格式化为字符串,并赋值给新的NSString对象15     NSString *plainText = [NSString stringWithFormat:@"pressing %@ button",title];16     17 //    _statusLabel.text = plainText;    //将格式化的字符串赋给标签的text属性18     19     //可变的字符串属性类,创建对象20     NSMutableAttributedString *textStyle = [[NSMutableAttributedString alloc]initWithString:plainText];21     22     //NSDictionary字典新语法 @{}用于保存字符串属性..  NSArray 数组新语法是 @[]23     NSDictionary *dict =24     @{25       NSFontAttributeName:[UIFont boldSystemFontOfSize:_statusLabel.font.pointSize]26       };27     28     //取出plainText字符串中待改变的子字符串  即 title  也可以使用@""取出其他字符串29     NSRange nameRange = [plainText rangeOfString:title];30     31     //设置字符串属性. 32     [textStyle setAttributes:dict range:nameRange];33     34     _statusLabel.attributedText = textStyle;35     36     37 }38 @end