iOS 中UIButton中文字换行

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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];