ios - 移動中に画像を保持してドラッグするにはどうすればよいですか?

Question

これは、画像をランダムに移動するコードとタッチコードのコードです。

-(void)viewDidAppear:(BOOL)animated {

timer = [NSTimer scheduledTimerWithTimeInterval:5 target:self selector:@selector(randomizeXandY) userInfo:nil repeats:YES];
}

-(void)randomizeXandY {

CGFloat x = (CGFloat) (arc4random() % (int) self.view.bounds.size.width);
CGFloat y = (CGFloat) (arc4random() % (int) self.view.bounds.size.height);

[self moveObjectsAtX:x Y:y];

}

-(void)moveObjectsAtX:(CGFloat)x Y:(CGFloat)y {

[UIView animateWithDuration:5 animations:^{
    imgView.center = CGPointMake(x, y);
}];

}

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {

UITouch *touch = [[event allTouches]anyObject];
CGPoint touchLocation = [touch locationInView:self.view];

  if ([touch view] == imgView) {

      imgView.center = touchLocation;
  }

}

Answer 1

これらの方法を使用する必要があります。

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [[event allTouches] anyObject];
    CGPoint touchLocation = [touch locationInView:self.view];

   //...
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {

    UITouch *touch = [[event allTouches] anyObject];
    CGPoint touchLocation = [touch locationInView:self.view];
    //..

}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [[event allTouches] anyObject];
    CGPoint touchLocation = [touch locationInView:self.view];

   //...
}

touchesBegan メソッドで、タッチが画像にあるかどうかを確認します。

if (CGRectContainsPoint(yourImage.frame, touchLocation)){
    dragging = YES;
}

はいの場合は、グローバル変数を設定します。たとえば、bool を YES にドラッグします。

in touchesMoved:

小切手

if (dragging){
   yourImage.frame = CGRectMake(touchLocation.x, touchLocation.y,yourImage.frame.size.widht,yourImage.frame.size.height);
}

in touchesEnded: ドラッグを NO に設定

ドラッグ = いいえ;

そう ：

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [[event allTouches] anyObject];
    CGPoint touchLocation = [touch locationInView:self.view];

    if (CGRectContainsPoint(yourImage.frame, touchLocation)){
        dragging = YES;
        [timer invalidate];
        timer = nil;
    }
    //...
}

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {

    UITouch *touch = [[event allTouches] anyObject];
    CGPoint touchLocation = [touch locationInView:self.view];

    if (dragging){
        yourImage.frame = CGRectMake(touchLocation.x, touchLocation.y,yourImage.frame.size.widht,yourImage.frame.size.height);
    }
    //..

}

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [[event allTouches] anyObject];
    CGPoint touchLocation = [touch locationInView:self.view];

    dragging = NO;
    //...
}