我有一个带有多个子视图的 UIView 和一个可识别的关联点击手势,我想模仿它具有“触摸”效果。也就是说,当点击发生时,我想显示容器视图具有不同的背景颜色,并且任何子视图 UILabels 的文本也看起来突出显示。
当我收到来自 UITapGestureRecognizer 的点击事件时,我可以很好地更改背景颜色,甚至将 UILabel 设置为
[label setHighlighted:YES];
由于各种原因,我无法将UIView更改为UIControl。
但是如果我添加一些 UIViewAnimation 来恢复突出显示,则什么也不会发生。有什么建议吗?
- (void)handleTapGesture:(UITapGestureRecognizer *)tapGesture {
[label setHighlighted:YES]; // change the label highlight property
[UIView animateWithDuration:0.20
delay:0.0
options:UIViewAnimationOptionCurveEaseIn
animations:^{
[containerView setBackgroundColor:originalBgColor];
[label setHighlighted:NO]; // Problem: don't see the highlight reverted
} completion:^(BOOL finished) {
// nothing to handle here
}];
}
setHighlighted 不是可动画化的视图属性。另外,您说的是两个相反的事情:您同时将突出显示设置为“是”和“否”。结果将是什么也没有发生,因为没有整体改变。
使用完成处理程序或延迟性能来更改突出显示稍后。
编辑:
你说“都试过了,但都没有成功。”也许您需要澄清我所说的延迟性能的含义。我刚刚尝试过,效果非常好:
- (void) tapped: (UIGestureRecognizer*) g {
label.highlighted = YES;
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, 0.2 * NSEC_PER_SEC);
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
label.highlighted = NO;
});
}
标签必须具有与其
textColor
不同的 highlightedTextColor
,以便发生可见的事情。
斯威夫特4
您可以使用自定义视图,例如:
class HighlightView: UIView {
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
DispatchQueue.main.async {
self.alpha = 1.0
UIView.animate(withDuration: 0.4, delay: 0.0, options: .curveLinear, animations: {
self.alpha = 0.5
}, completion: nil)
}
}
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
DispatchQueue.main.async {
self.alpha = 0.5
UIView.animate(withDuration: 0.4, delay: 0.0, options: .curveLinear, animations: {
self.alpha = 1.0
}, completion: nil)
}
}
override func touchesCancelled(_ touches: Set<UITouch>, with event: UIEvent?) {
DispatchQueue.main.async {
self.alpha = 0.5
UIView.animate(withDuration: 0.4, delay: 0.0, options: .curveLinear, animations: {
self.alpha = 1.0
}, completion: nil)
}
}
}
随意调整持续时间和动画。最后,您可以使用它代替
UIView
,每当您单击它时,它都会更改其 alpha
值,因此它看起来像一个突出显示。
简单的解决方案是覆盖点击手势识别器 就像下面这样:
斯威夫特 4.x
class TapGestureRecognizer: UITapGestureRecognizer {
var highlightOnTouch = true
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent) {
super.touchesBegan(touches, with: event)
if highlightOnTouch {
let bgcolor = view?.backgroundColor
UIView.animate(withDuration: 0.1, delay: 0, options: [.allowUserInteraction, .curveLinear], animations: {
self.view?.backgroundColor = .lightGray
}) { (_) in
UIView.animate(withDuration: 0.1, delay: 0, options: [.allowUserInteraction, .curveLinear], animations: {
self.view?.backgroundColor = bgcolor
})
}
}
}
}
斯威夫特 5.7
import UIKit
final class HighlightingTapRecognizer: UITapGestureRecognizer {
private(set) var viewToHighlight: UIView
init(target: Any?, action: Selector?, viewToHighlight: UIView) {
self.viewToHighlight = viewToHighlight
super.init(target: target, action: action)
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent) {
super.touchesBegan(touches, with: event)
UIView.animate(withDuration: 0.1, delay: 0, options: [.allowUserInteraction, .curveLinear], animations: {
self.viewToHighlight.alpha = 0.7
})
}
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent) {
super.touchesEnded(touches, with: event)
UIView.animate(withDuration: 0.1, delay: 0, options: [.allowUserInteraction, .curveLinear], animations: {
self.viewToHighlight.alpha = 1
})
}
}
Swift 4 及以上版本
final class HighlightingTapRecognizer: UITapGestureRecognizer {
private(set) var viewToHighlight: UIView
init(target: Any?, action: Selector?, viewToHighlight: UIView) {
self.viewToHighlight = viewToHighlight
super.init(target: target, action: action)
}
override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent) {
super.touchesEnded(touches, with: event)
let xPosition = touches.first?.location(in: viewToHighlight).x
let yPosition = touches.first?.location(in: viewToHighlight).y
let width = 30
let height = 30
let view11 = UIView(frame: CGRect(x: Int(xPosition!), y: Int(yPosition!), width: width, height: height))
view11.isHidden = true
view11.backgroundColor = .darkGray.withAlphaComponent(0.5)
view11.layer.cornerRadius = view11.frame.height / 2
view11.layer.masksToBounds = true
self.viewToHighlight.addSubview(view11)
view11.isHidden = false
Timer.scheduledTimer(withTimeInterval: 0.5, repeats: false, block: { _ in
view11.removeFromSuperview()
})
}
}
用途:
let tap = HighlightingTapRecognizer(target: self, action: #selector(self.YourActionFunc(_:)), viewToHighlight: previewView)
previewView.addGestureRecognizer(tap)