如何将UIButton的标题设置为左对齐？

我须要从UIButton左侧显示电子邮件地址，可是它位于中间。

有什么办法能够将对齐方式设置到UIButton的左侧？

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];

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#1楼

此处说明了如何执行操做以及其工做原理： http : //cocoathings.blogspot.com/2013/03/how-to-make-uibutton-text-left-or-right.html

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#2楼

若是您不想更改按钮内的整个内容位置，则使用emailBtn.titleEdgeInsets优于contentEdgeInsets 。

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#3楼

若是您不想在代码中进行调整，也可使用界面生成器。 在这里，我使文本左对齐并缩进一些：

不要忘记，您也能够在按钮中对齐图像。

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#4楼

UIButton *btn;
btn.contentVerticalAlignment = UIControlContentVerticalAlignmentTop;
btn.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;

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#5楼

设置contentHorizo​​ntalAlignment：

emailBtn.contentHorizontalAlignment = .left;

您可能还须要调整左插图的内容，不然文本将触摸左边框：

emailBtn.contentEdgeInsets = UIEdgeInsetsMake(0, 10, 0, 0);

// Swift 3 and up:
emailBtn.contentEdgeInsets = UIEdgeInsets(top: 0, left: 10, bottom: 0, right: 0);