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];
在Swift 5.0和Xcode 10.2中
有两种方法
1)直接方法
btn.contentHorizontalAlignment = .left
2) SharedClass示例(编写一次，然后使用每个ware)
这是您的共享类(像这样您可以访问所有组件属性)
import UIKit
class SharedClass: NSObject {
static let sharedInstance = SharedClass()
private override init() {
}
}
//UIButton extension
extension UIButton {
func btnProperties() {
contentHorizontalAlignment = .left
}
}
在你的ViewController调用中
button.btnProperties()//This is your button
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);
