我需要在UIButton的左侧显示一个电子邮件地址，但它被定位到中心。
有什么方法来设置对齐到UIButton的左边?
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contentthorizontalalign:
// Swift
emailBtn.contentHorizontalAlignment = .left;
// Objective-C
emailBtn.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
你可能还想调整内容的左插入，否则文本将触及左边框:
// Swift 3 and up:
emailBtn.contentEdgeInsets = UIEdgeInsets(top: 0, left: 10, bottom: 0, right: 0);
// Objective-C
emailBtn.contentEdgeInsets = UIEdgeInsetsMake(0, 10, 0, 0);
如果你使用按钮。contenttedgeinsets = UIEdgeInsets(top: 10, left: 10, bottom: 10, right: 10)，你会得到一个警告，声明“contenttedgeinsets”在iOS 15.0中已弃用:使用UIButtonConfiguration时忽略此属性。另一种解决方案是:
15、0 +。
var button: UIButton = {
let button = UIButton(configuration: .filled())
button.configuration?.contentInsets = NSDirectionalEdgeInsets(top: 16, leading: 20, bottom: 16, trailing: 20)
button.contentHorizontalAlignment = .leading
return button
}()
@DyingCactus的代码有一个小错误。
下面是正确的解决方案，添加一个UILabel到UIButton来对齐按钮文本，以更好地控制按钮的“标题”:
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];
希望这有助于....
Al
