[英]How to slide a button from the bottom after sliding from the edge?
我已經實現了以下兩種方法
-(void)addGestureToWebView {
[self setBottomEdgeGesture:[[UIScreenEdgePanGestureRecognizer alloc] initWithTarget:self action:@selector(handleBottomEdgeGesture:)]];
[[self bottomEdgeGesture] setEdges:UIRectEdgeBottom];
[[self bottomEdgeGesture] setDelegate:self];
[[self webView] addGestureRecognizer:[self bottomEdgeGesture]];
}
和
-(IBAction)handleBottomEdgeGesture:(UIScreenEdgePanGestureRecognizer *)gesture {
if(UIGestureRecognizerStateBegan == [gesture state] || UIGestureRecognizerStateChanged == [gesture state]) {
//Do something
}
}
方法handleBottomEdgeGesture
應該從底部滑動三個點的按鈕。
我試過了
UIButton *btnDots = [[UIButton alloc] initWithFrame:CGRectMake(280.0, 528.0, 20, 20)];
[btnDots setTitle:@"..." forState:UIControlStateNormal];
[btnDots setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
但是什么也沒發生。 我的顯示器上沒有看到任何點。 我是Objective-C的新手,有些東西不太容易開發。
誰能給我一個好的建議?
由於您以編程方式創建了按鈕,因此還需要將其添加到子視圖中。 然后在手勢識別器上,您應該更改按鈕的框架。 需要引用該按鈕。
可以說您正在視圖控制器中執行此操作。 為點按鈕創建一個屬性。 在確實加載視圖的情況下,創建按鈕並將其分配給屬性:
UIButton *dotButton = [[UIButton alloc] initWithFrame:CGRectMake(.0f, self.view.frame.size.height, self.view.frame.size.width, 20.0f)];
// do additional button setup
[self.view addSubview:dotButton];
[dotButton addTarget:self action:@selector(onDotButtonPressed) forControlEvents:UIControlEventTouchUpInside];
self.dotButton = dotButton;
然后,在手勢識別器中,您有2個選項。 只需處理事件並顯示動畫按鈕即可,或者隨着手指移動來移動其框架:
- (void)onGesture:(UIGestureRecognizer *)sender
{
#ifdef USE_ONLY_ON_EVENT
if(sender.state == UIGestureRecognizerStateBegan)
{
[UIView animateWithDuration:.23 animations:^{
self.dotButton.frame = CGRectMake(.0f, self.view.frame.size.height-self.dotButton.frame.size.height, self.view.frame.size.width, self.dotButton.frame.size.height);
}];
}
#else
if(sender.state == UIGestureRecognizerStateBegan || sender.state == UIGestureRecognizerStateChanged)
{
CGPoint location = [sender locationInView:self.view];
CGFloat yOffset = self.view.frame.size.height - location.y;
if(yOffset > self.dotButton.frame.size.height)
{
yOffset = self.dotButton.frame.size.height;
}
self.dotButton.frame = CGRectMake(.0f, self.view.frame.size.height-yOffset, self.view.frame.size.width, self.dotButton.frame.size.height);
}
else if(sender.state == UIGestureRecognizerStateEnded || sender.state == UIGestureRecognizerStateCancelled)
{
CGPoint location = [sender locationInView:self.view];
CGFloat yOffset = self.view.frame.size.height - location.y;
if(yOffset > self.dotButton.frame.size.height*.5f) // more then half of a button visible
{
// show full button
[UIView animateWithDuration:.23 animations:^{
self.dotButton.frame = CGRectMake(.0f, self.view.frame.size.height-self.dotButton.frame.size.height, self.view.frame.size.width, self.dotButton.frame.size.height);
}];
}
else
{
// hide button
[UIView animateWithDuration:.23 animations:^{
self.dotButton.frame = CGRectMake(.0f, self.view.frame.size.height, self.view.frame.size.width, self.dotButton.frame.size.height);
}];
}
}
#endif
}
希望您從代碼中得到基本的想法。
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