我如何创建一个基本的UIButton编程?例如,在我的视图控制器中,当执行viewDidLoad方法时,将动态创建三个uibutton,并设置其布局或属性。
当前回答
Swift 3版本应该是:
let myButton:UIButton = {
let myButton = UIButton() // If you want to set the type use like
// UIButton(type: .RoundedRect) or
// UIButton(type: .Custom)
myButton.setTitle("Hai Touch Me", for: .normal)
myButton.setTitleColor(UIColor.blue, for: .normal)
myButton.frame = CGRect(x: 20, y: 20, width: 100, height: 40)
myButton.addTarget(self, action: #selector(ViewController.pressedAction(_:)), for: .touchUpInside)
self.view.addSubview(myButton)
return myButton
}()
其他回答
-(UIButton *)addButton:(NSString *)title :(CGRect)frame : (SEL)selector :(UIImage *)image :(int)tag{
UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
btn.frame = frame;
[btn addTarget:self action:selector forControlEvents:UIControlEventTouchUpInside];
[btn setTitle:title forState:UIControlStateNormal];
[btn setImage:image forState:UIControlStateNormal];
btn.backgroundColor = [UIColor clearColor];
btn.tag = tag;
return btn;
}
你可以把它添加到视图中:
[self.view addSubview:[self addButton:nil :self.view.frame :@selector(btnAction:) :[UIImage imageNamed:@"img.png"] :1]];
你可以通过这段代码创建按钮。
UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
[btn addTarget:self action:@selector(btnAction) forControlEvents:UIControlEventTouchDragInside];
[btn setTitle:@"click button" forState:UIControlStateNormal];
btn.frame = CGRectMake(50, 100, 80, 40);
[self.view addSubview:btn];
下面是按钮动作方法
-(void)btnAction
{
NSLog(@"button clicked");
}
在Swift 5和Xcode 10.2中
基本上我们有两种类型的按钮。
1)系统类型按钮
2)自定义类型按钮(在自定义类型按钮中,我们可以为按钮设置背景图像)
而且这两种类型的按钮控制状态很少https://developer.apple.com/documentation/uikit/uicontrol/state
重要的州有
1)正常状态
2)选定状态
3)高亮状态
4)禁用状态……
//For system type button
let button = UIButton(type: .system)
button.frame = CGRect(x: 100, y: 250, width: 100, height: 50)
// button.backgroundColor = .blue
button.setTitle("Button", for: .normal)
button.setTitleColor(.white, for: .normal)
button.titleLabel?.font = UIFont.boldSystemFont(ofSize: 13.0)
button.titleLabel?.textAlignment = .center//Text alighment center
button.titleLabel?.numberOfLines = 0//To display multiple lines in UIButton
button.titleLabel?.lineBreakMode = .byWordWrapping//By word wrapping
button.tag = 1//To assign tag value
button.btnProperties()//Call UIButton properties from extension function
button.addTarget(self, action:#selector(self.buttonClicked), for: .touchUpInside)
self.view.addSubview(button)
//For custom type button (add image to your button)
let button2 = UIButton(type: .custom)
button2.frame = CGRect(x: 100, y: 400, width: 100, height: 50)
// button2.backgroundColor = .blue
button2.setImage(UIImage.init(named: "img.png"), for: .normal)
button2.tag = 2
button2.btnProperties()//Call UIButton properties from extension function
button2.addTarget(self, action:#selector(self.buttonClicked), for: .touchUpInside)
self.view.addSubview(button2)
@objc func buttonClicked(sender:UIButton) {
print("Button \(sender.tag) clicked")
}
//You can add UIButton properties using extension
extension UIButton {
func btnProperties() {
layer.cornerRadius = 10//Set button corner radious
clipsToBounds = true
backgroundColor = .blue//Set background colour
//titleLabel?.textAlignment = .center//add properties like this
}
}
要以编程方式在控制器视图中添加一个按钮,请使用以下命令:
-(void)viewDidLoad
{
UIButton * btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
btn.frame = CGRectMake(0, 0, 100, 50);
[btn setTitle:@"Hello, world!" forState:UIControlStateNormal];
[self.view addSubview:btn];
}
要加入其中三种,冲洗并重复。
UIButton *custombutton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[custombutton addTarget:self
action:@selector(aMethod:)
forControlEvents:UIControlEventTouchUpInside];
[custombutton setTitle:@"Click" forState:UIControlStateNormal];
custombutton.frame = CGRectMake(80.0, 110.0, 160.0, 40.0);
custombutton.titleLabel.textColor = [UIColor colorWithRed: 2.0f/255.0f green: 155.0f/255.0f blue: 213.0f/255.0f alpha:1];
[custombutton setImage:[UIImage imageNamed:@"hh.png"] forState:UIControlStateNormal];
[view addSubview:custombutton];
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