[英]How to add action for UIButton
我是 iPhone 技术的新手。 请任何人告诉我如何为 UIButton 添加操作。
UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
btn.frame = CGRectMake(0, 0, 100, 25);
btn.backgroundColor = [UIColor clearColor];
[btn setTitle:@"Play" forState:UIControlStateNormal];
[btn addTarget:self action:(buttonClick:) forControlEvents:UIControlEventTouchUpInside];
btn.center = self.center;
[self addSubview:btn];
用这个
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button addTarget:self
action:@selector(aMethod:)forControlEvents:UIControlEventTouchDown];
[button setTitle:@"Show View" forState:UIControlStateNormal];
button.frame = CGRectMake(80.0, 210.0, 160.0, 40.0);
[view addSubview:button];
您可以使用@selector()指定选择器。 所以, action参数看起来像,
action:@selector(buttonClick:)
SWIFT代码:
button.addTarget(self, action:"action_button", forControlEvents:.TouchUpInside)
...
func action_button() {
// implement me
}
使用像这样
UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
btn.frame = CGRectMake(0, 0, 100, 25);
btn.backgroundColor = [UIColor clearColor];
[btn setTitle:@"Play" forState:UIControlStateNormal];
[btn addTarget:self action:@selector(btnTapped:) forControlEvents:UIControlEventTouchUpInside];
btn.center = self.center;
[self addSubview:btn];
并添加您的选择器方法
-(IBAction)btnTapped:(id)sender{
}
action:@selector(buttonClick:)
@objc
UIButton
。 像这样:menuButton.addTarget(self, action: #selector(menuTapped), for: .touchUpInside)
从 Ios14 开始,您可以使用 UIAction 而不是 addTarget:
// Example: action to remove or add in the favorite list of recipes
button.addAction(
UIAction { _ in
if self.isFavorite {
self.isFavorite = false
print("✅: Recipe is not favorite")
} else {
self.isFavorite = true
print("✅ Recipe is favorite")
}
}, for: .touchUpInside)
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.