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
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
}
}
其他回答
试一试……
UIButton *finalPriceBtn=[UIButton buttonWithType:UIButtonTypeRoundedRect];
finalPriceBtn.frame=CGRectMake(260, 25, 45, 15);
[finalPriceBtn addTarget:self action:@selector(goBtnClk:) forControlEvents:UIControlEventTouchUpInside];
finalPriceBtn.titleLabel.font=[UIFont systemFontOfSize:12];
[finalPriceBtn setTitle:[NSString stringWithFormat:@"$%.2f",tempVal] forState:UIControlStateNormal];
finalPriceBtn.titleLabel.textColor = [UIColor colorWithRed: 2.0f/255.0f green: 155.0f/255.0f blue: 213.0f/255.0f alpha:1];
finalPriceBtn.titleLabel.textAlignment=UITextAlignmentLeft;
[imageView addSubview:finalPriceBtn];
希望我能帮上忙。
如果愿意,可以将创建者实例放入循环中,并从数组中动态添加名称。
UIButton *saveLibrary=[UIButton buttonWithType:UIButtonTypeCustom];
[saveLibrary setTitle:@"Library" forState:UIControlStateNormal];
[saveLibrary setBackgroundColor:[UIColor redColor]];
[saveLibrary addTarget:self
action:@selector(saveOnGalleryButtonIsPressed) forControlEvents:UIControlEventTouchUpInside];
[saveLibrary setImage:[UIImage imageWithContentsOfFile:[[[NSBundle mainBundle] bundlePath] stringByAppendingString:@"/library225.png"]]forState:UIControlStateNormal];
saveLibrary.frame=CGRectMake(323, 15, 75, 75);
[self.view addSubview:saveLibrary];
拜托,都2014年了!为什么代码块评估分配还没有被使用,因为趋势表明这是未来的趋势!
UIButton* button = ({
//initialize button with frame
UIButton* button = [[UIButton alloc] initWithFrame:({
CGRect frame = CGRectMake(10.0, 10.0, 200.0, 75.0);
frame;
})];
//set button background color
[button setBackgroundColor:({
UIColor* color = [UIColor colorWithRed:1.0 green:1.0 blue:0.0 alpha:1.0];
color;
})];
//set button title for state
[button setTitle:({
NSString* string = [NSString stringWithFormat:@"title words"];
string;
}) forState:({
UIControlState state = UIControlStateNormal;
state;
})];
//set selector
[button addTarget:self action:({
SEL select = @selector(method:);
select;
}) forControlEvents:({
UIControlEvents event = UIControlEventTouchUpInside;
event;
})];
//return button
button;
});
[self.view addSubview:button];
哇!
或者确切的结果可以这样完成:
UIButton* button = [[UIButton alloc] initWithFrame:CGRectMake(10.0, 10.0, 200.0, 75.0)];
[button setBackgroundColor:[UIColor colorWithRed:1.0 green:1.0 blue:0.0 alpha:1.0]];
[button setTitle:@"title words" forState:UIControlStateNormal];
[button addTarget:self action:@selector(method:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];
UIButton *buttonName = [UIButton
buttonWithType:UIButtonTypeRoundedRect];
[buttonName addTarget:self
action:@selector(aMethod:)forControlEvents:UIControlEventTouchDown];
[buttonName setTitle:@"Show View" forState:UIControlStateNormal];
.frame = CGRectMake(80.0, 210.0, 160.0, 40.0); [view
addSubview:buttonName];
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