我有一个 UIButton
,我尝试以编程方式更改它的大小,但它没有效果。
这是我写的:
import UIKit
class HomeVC: UIViewController {
let addGroupBtn = UIButton(frame: CGRect(x: 0, y: 0, width: 50, height: 50))
let addGroupLabel = UILabel()
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = UIColor(red: 110/255, green: 178/255, blue: 87/255, alpha: 1.0)
setAddGroupBtn()
}
func setAddGroupBtn(){
addGroupBtn.setImage(UIImage(named: "addIcon"), for: .normal)
addGroupBtn.addTarget(self, action: #selector(moveToAddGroup), for: .touchUpInside)
addGroupBtn.translatesAutoresizingMaskIntoConstraints = false
self.view.addSubview(addGroupBtn)
addGroupBtn.topAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.topAnchor, constant: 50).isActive = true
addGroupBtn.leadingAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.leadingAnchor, constant: 14).isActive = true
}
func setAddGroupLabel(){
addGroupLabel.translatesAutoresizingMaskIntoConstraints = false
addGroupLabel.text = "Add Group"
}
@objc func moveToAddGroup(){
print("ADD GROUP")
//Move to another VC
}
}
最佳答案
你需要加上 widthAnchor
& heightAnchor
NSLayoutConstraint.activate([
addGroupBtn.topAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.topAnchor, constant: 50),
addGroupBtn.leadingAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.leadingAnchor, constant: 14),
addGroupBtn.widthAnchor.constraint(equalToConstant:50),
addGroupBtn.heightAnchor.constraint(equalToConstant:50)
])
由于按钮具有固有的内容大小,因此可以根据内容进行拉伸(stretch)
关于ios - 无法以编程方式更改 View 的大小,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/55433228/