[英]need UIButton inside custom UIView respond to touches
我有一些按钮作为子视图的自定义UIView。 我正在使用touchesBegan / Moved / Ended来用用户的手指旋转视图。 问题是,当我尝试从按钮拖动/旋转视图时,不会调用touches
方法。 我需要按钮来响应UIControlEventTouchUpInside
事件,但是如果将其与视图一起拖动,则使视图旋转。 我已经看过这个问题和这个问题,但是找不到任何一种对我有用的解决方案。
这是我的自定义视图代码:
- (id)initWithFrame:(CGRect)frame andRadius:(float)Radius andViews:
(NSMutableArray *)AllViews
{
self = [super initWithFrame:frame];
if (self) {
radius = Radius;
allViews = AllViews;
for(int i = 0; i < [allViews count]; i++){
//the "currentView" is a UIButton
UIView *currentView = (UIView *)[allViews objectAtIndex:i];
[currentView setFrame:CGRectMake(frame.size.width / 2 - 25 + radius * cos((2 * M_PI / [allViews count]) * i), frame.size.height / 2 - 25 + radius * sin((2 * M_PI / [allViews count]) * i), 50, 50)];
[self addSubview:currentView];
}
[self setBackgroundColor:[UIColor redColor]];
[self setAlpha:.5];
}
return self;
}
//- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event
//{
// for (UIView * view in [self subviews]) {
// if ([view pointInside:[self convertPoint:point toView:view] withEvent:event]) {
// return YES;
// }
// }
// return NO;
//}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint point = [touch locationInView:self];
x = point.x;
y = point.y;
NSLog(@"touchesBegan");
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint point = [touch locationInView:self];
float X = point.x;
float Y = point.y;
float a = sqrt(X * X + Y * Y);
float b = sqrt(x * x + y * y);
float c = sqrt((x - X) * (x - X) + (y - Y) * (y - Y));
float alpha = acos((a * a + b * b - (c * c)) / (2 * a * b));
if(alpha == NAN)
alpha = 0;
alpha = -alpha;
[UIView beginAnimations:@"rotate" context:nil];
[UIView setAnimationDuration:0];
[UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
self.transform = CGAffineTransformRotate(self.transform, alpha);
[UIView commitAnimations];
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint point = [touch locationInView:self];
float X = point.x;
float Y = point.y;
float a = sqrt(X * X + Y * Y);
float b = sqrt(x * x + y * y);
float c = sqrt((x - X) * (x - X) + (y - Y) * (y - Y));
float alpha = acos((a * a + b * b - (c * c)) / (2 * a * b));
alpha = -alpha;
[UIView beginAnimations:@"rotate" context:nil];
[UIView setAnimationDuration:0.5];
[UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
self.transform = CGAffineTransformRotate(self.transform, alpha);
[UIView commitAnimations];
NSLog(@"touchesEnded");
}
- (void)dealloc
{
[allViews release];
[super dealloc];
}
有什么建议么?
也许不是您要找的答案,但是:
我不确定为什么要通过拖动后的视图将“手指按下按钮然后将手指拖动到按钮外部”活动作为拖动/旋转动作。 就我而言,如果您将手指放在按钮内,则表示您正在与按钮交互,而不是背后的视图; 并且如果您仍在触摸屏幕的同时将手指从按钮上移开,则是为了中止按钮的按下(即您已经“武装”了它,但没有“触发”它),而不与后面的视图进行交互。
所以我要说的是:您为什么要这样做? 也许您需要重新考虑您的UI设计。
如果您绝对想这样做,则可以考虑使用UIGestureRecognizer
而不是touchesBegan
等touchesBegan
使用它们时,您可以更轻松地设置更复杂的场景。 但是手势识别器并非在所有版本的iOS上都可用。
或者,实现看起来像按钮的东西或您想要的任何东西,并使用touchesBegan等方法处理它的触摸(以及视图拖动等)-即,不要使用实际的按钮。
万一有人遇到类似问题,我将发布我使用的解决方案。 我覆盖了另一个用作按钮的UIView
类。 在每个touchedBegan/Moved/Ended
,我实现了单击按钮所需的代码,然后将触摸命令链传递给下一个自定义UIView
,如下所示:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
[self.nextResponder touchesBegan:touches withEvent:event];
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
[self.nextResponder touchesMoved:touches withEvent:event];
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint point = [touch locationInView:self];
if (point.x < self.frame.size.width && point.y < self.frame.size.height) {
NSDictionary *userInfo = [[NSDictionary alloc] initWithObjectsAndKeys:[NSString stringWithFormat:@"%d", self.tag], @"tag", nil];
[[NSNotificationCenter defaultCenter] postNotificationName:@"ChangeFilter" object:self userInfo:userInfo];
}
[self.nextResponder touchesEnded:touches withEvent:event];
}
请注意,我使用NSNotifications将操作发送到包含重写视图的ViewController
。
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