我需要从的左侧显示电子邮件地址UIButton，但该电子邮件地址位于中间。
有什么方法可以将对齐方式设置为a的左侧UIButton吗？
这是我当前的代码：
UIButton* emailBtn = [[UIButton alloc] initWithFrame:CGRectMake(5,30,250,height+15)];
emailBtn.backgroundColor = [UIColor clearColor];
[emailBtn setTitle:obj2.customerEmail forState:UIControlStateNormal];
emailBtn.titleLabel.font = [UIFont systemFontOfSize:12.5];
[emailBtn setTitleColor:[[[UIColor alloc]initWithRed:0.121 green:0.472 blue:0.823 alpha:1]autorelease] forState:UIControlStateNormal];
[emailBtn addTarget:self action:@selector(emailAction:) forControlEvents:UIControlEventTouchUpInside];
[elementView addSubview:emailBtn];
[emailBtn release];
设置contentHorizontalAlignment：
emailBtn.contentHorizontalAlignment = .left;
您可能还需要调整左插图的内容，否则文本将触摸左边框：
emailBtn.contentEdgeInsets = UIEdgeInsetsMake(0, 10, 0, 0);
// Swift 3 and up:
emailBtn.contentEdgeInsets = UIEdgeInsets(top: 0, left: 10, bottom: 0, right: 0);
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