关于objective c：如何将UIButton的标题设置为左对齐？

How to set the title of UIButton as left alignment?

我需要显示UIButton左侧的电子邮件地址，但它位于中间。

是否有任何方法可以设置到UIButton左侧的对齐？

这是我当前的代码：

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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ContentHorizontalSignment:

1	emailBtn.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;

您可能还需要调整左插入的内容，否则文本将接触左边框：

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

相关讨论

在SWIFT 3 +：

1	button.contentHorizontalAlignment = .left

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

斯威夫特4 +

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button.contentHorizontalAlignment = .left
button.contentVerticalAlignment = .top
button.contentEdgeInsets = UIEdgeInsets(top: 10, left: 10, bottom: 10, right: 10)

如果您不想更改按钮内的整个内容位置，那么使用emailBtn.titleEdgeInsets比contentEdgeInsets更好。

下面解释了如何实现这一目标以及为什么它会如此有效：http://cocoathings.blogspot.com/2013/03/how-to-make-uibutton-text-left-or-right.html

在Xcode 8.2.1中，在接口生成器中，它移动到： enter image description here 。

@dyingcactus的代码有一个小错误。以下是将uiLabel添加到uiButton以对齐按钮文本以更好地控制按钮"标题"的正确解决方案：

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NSString *myLabelText = @"Hello World";
UIButton *myButton = [UIButton buttonWithType:UIButtonTypeCustom];

// position in the parent view and set the size of the button
myButton.frame = CGRectMake(myX, myY, myWidth, myHeight);

CGRect myButtonRect = myButton.bounds;
UILabel *myLabel = [[UILabel alloc] initWithFrame: myButtonRect];
myLabel.text = myLabelText;
myLabel.backgroundColor = [UIColor clearColor];
myLabel.textColor = [UIColor redColor];
myLabel.font = [UIFont fontWithName:@"Helvetica Neue" size:14.0];
myLabel.textAlignment = UITextAlignmentLeft;

[myButton addSubview:myLabel];
[myLabel release];

希望这有帮助…

铝

斯威夫特2：

1	emailBtn.contentHorizontalAlignment = UIControlContentHorizontalAlignment.Left

如果有人需要，这会有所帮助。

在Swift 5.0和Xcode 10.2中

你有两种方法接近

1)直接进近

1	btn.contentHorizontalAlignment = .left

2)sharedclass示例(只写一次，使用每个软件)

这是您的共享类(像这样，您可以访问所有组件属性)

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import UIKit

class SharedClass: NSObject {

static let sharedInstance = SharedClass()

private override init() {

}
}

//UIButton extension
extension UIButton {
func btnProperties() {
contentHorizontalAlignment = .left
}
}

在你的视图控制器中调用如下

1	button.btnProperties()//This is your button