我有一个长按手势识别的视图中它:UIMenuController不响应第一选择,只有第二
- (id)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressDetected:)];
[self addGestureRecognizer:longPress];
[longPress release];
}
return self;
}
当检测到长按,我想显示UIMenuViewController以上述观点来看在这一个动作,而当该菜单项被窃听我想执行块:
- (void)longPressDetected:(UILongPressGestureRecognizer *)recognizer {
if (recognizer.state == UIGestureRecognizerStateBegan) {
[self becomeFirstResponder];
UIMenuController *menuController = [UIMenuController sharedMenuController];
UIMenuItem *actionItem = [[UIMenuItem alloc] initWithTitle:@"Action" action:@selector(someActionSelector)];
[menuController setMenuItems:[NSArray arrayWithObject:actionItem]];
[actionItem release];
[menuController setTargetRect:self.frame inView:self.superview];
[menuController setMenuVisible:YES animated:YES];
}
}
- (BOOL)canBecomeFirstResponder {
return YES;
}
- (BOOL)canPerformAction:(SEL)action withSender:(id)sender {
if (action == @selector(copy:) || action == @selector(cut:) || action == @selector(delete:) ||
action == @selector(paste:) || action == @selector(select:) || action == @selector(selectAll:)) {
return NO;
}
else if (action == @selector(someActionSelector)) {
return YES;
}
else {
return [super canPerformAction:action withSender:sender];
}
}
- (void)someActionSelector {
if (self.actionBlock) {
self.actionBlock();
}
}
问题是,这只是第二长按,然后点按组合后的作品。我第一次长按视图,我看到菜单,但点击菜单什么都不做。第二次再次看到菜单时,我点击它,然后块被执行。
调试器显示someActionSelector
中的断点只在第二次敲击时到达。任何想法为什么这是?
您是否尝试将'UIGestureRecognizerStateBegan'更改为'UIGestureRecognizerStateRecognized'? – Costique 2012-03-14 19:12:22