UIButton *button =[[UIButton alloc]initWithFrame:CGRectMake(100, 100, 200, 40)];
button.backgroundColor = [UIColor redColor];
[button setTitle:@"我是Chenhaijian\n 我要换行" forState:UIControlStateNormal];
button.titleLabel.lineBreakMode = 0;//这句话很重要，不加这句话加上换行符也没用
[self.view addSubview:button];
屏幕快照 2016-05-11 14.59.17.png
