水平移动 UIView 时出现错误

Question

我已经为 iPad 创建了一个拼图引擎（iOS SDK 4.2），

我有一个 PuzzleViewController，它控制一个 UIView（rootView），该 UIView 包含一个较小的 UIView（puzzleView）和 12 个拼图（PuzzlePieceView 类扩展了 UIImageView）。

这个想法很简单。 puzzlePieces 围绕 puzzleView 并被拾取并拖动到 puzzleView。当这些碎片被拾取时，它们的尺寸会增加一倍，并集中在手指触摸的地方。 当它们被放置在正确的位置时，它们会保持原状（它们从 rootView 中删除并作为子视图添加到 puzzleView 中），如果它们被放置在错误的位置，它们会返回到原始位置和大小。

目前，我正在覆盖 PuzzlePieceView 类中的开始/移动/结束/取消触摸，以便每个 PuzzlePiece 控制自己的移动。

这就是他们所做的

#pragma mark UIResponder overriding

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    NSLog(@"PuzzlePiece touchesBegan");
    if (!isDeployed) {
        if (self.initialSize.width == 0 || self.initialSize.height ==0) { //if there is still no initial size
            self.initialSize = self.frame.size;
        }
        NSLog(@"self.initialLocation.x %f %f", self.initialLocation.x, self.initialLocation.y);
        if (self.initialLocation.x == 0. || self.initialLocation.y == 0.) { //if there is still no initial location
            self.initialLocation = self.center; //record the initial location
        }
        UITouch *touch = [[event allTouches] anyObject];
        self.center = [touch locationInView:self.superview]; //set the center of the view as the point where the finger touched it
        [self.superview bringSubviewToFront:self]; //the piece brings itself as frontMostView so that it is always visible and never behind any other piece while moving
    }
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    NSLog(@"PuzzlePiece touchesMoved");
    if (self.frame.size.width == self.initialSize.width) {
        self.frame = CGRectMake(self.frame.origin.x, self.frame.origin.y, self.image.size.width, self.image.size.height);
    }
    if (!isDeployed) {
        UITouch *touch = [[event allTouches] anyObject];
        self.center = [touch locationInView:self.superview]; //set the center of the view as the point where the finger moved to
    }
}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    NSLog(@"PuzzlePiece touchesEnded");
    if (!isDeployed) {
        UITouch *touch = [[event allTouches] anyObject];
        NSLog(@"point %@ x%f y%f", self.puzzleView, [touch locationInView:self.puzzleView].x, [touch locationInView:self.puzzleView].y);
        if (CGRectContainsPoint(self.dropZone,[touch locationInView:self.puzzleView])) {
            [self removeFromSuperview];
            [self.puzzleViewController addPiece:self];
            self.center = self.finalCenter;
            self.isDeployed = YES;
        }
        else {
            [self restoreToInitialSize];
            [self restoreToInitialPosition];
        }
    }

}

- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event {
    NSLog(@"PuzzlePiece touchesCancelled");
    if (!isDeployed) {
        [self restoreToInitialSize];
        [self restoreToInitialPosition];
    } 
}

#pragma mark -

看起来很简单，确实如此。

我只剩下一个错误了。 当我尝试在任何拼图上进行水平移动时，触摸会取消。 仅当移动快速开始时才会发生这种情况。如果我触摸这块碎片并等待一会儿（大约一秒钟），那么这些碎片就会完美地移动。 这些棋子也可以在垂直方向完美移动。

我尝试在第一次触摸视图时不更改 puzzlePiece 大小，但错误仍然存​​在......

Answer 1

我找到了解决这个问题的方法。
我的一位队友在 RootView 中注册了一个 UISwipeGestureRecognizer，而不是在应该识别 swipeGesture 的特定子视图中。