Question

UIView内有UIImageView和UIView。我使用Touches方法拖动UIImageView。

这很有效。我有一个问题。

当我触摸UIView中的任何地方时，我希望UIImageView拖动或移动。目前，UIImageview只能在触摸UIIMageView而不是UIView时移动。

self.scrollView.scrollEnabled = NO;
UIView *subview = [[UIView alloc] initWithFrame:CGRectMake(10, 135, 300, 200)];
subview.backgroundColor = [UIColor clearColor];

// Create an instance of the image to drag
ImageToDrag *img2 = [[ImageToDrag alloc] initWithImage:[UIImage imageNamed:@"markit_btn.png"]];
img2.center = CGPointMake(110, 75);
img2.userInteractionEnabled = YES;
[subview addSubview:img2];
[self.view  addSubview:subview];

我有一个单独的文件，我将其包含在UIView所在的控制器的头文件中。

- (id)initWithImage:(UIImage *)image
{
if (self = [super initWithImage:image])
    self.userInteractionEnabled = YES;
return self;
}

- (void) touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event
{
// When a touch starts, get the current location in the view
currentPoint = [[touches anyObject] locationInView:self];
}

- (void) touchesMoved:(NSSet*)touches withEvent:(UIEvent*)event
{
// Get active location upon move
CGPoint activePoint = [[touches anyObject] locationInView:self];

// Determine new point based on where the touch is now located
CGPoint newPoint = CGPointMake(self.center.x + (activePoint.x - currentPoint.x),
                             self.center.y + (activePoint.y - currentPoint.y));

//--------------------------------------------------------
// Make sure we stay within the bounds of the parent view
//--------------------------------------------------------
float midPointX = CGRectGetMidX(self.bounds);
// If too far right...
 if (newPoint.x > self.superview.bounds.size.width  - midPointX)
  newPoint.x = self.superview.bounds.size.width - midPointX;
else if (newPoint.x < midPointX)     // If too far left...
  newPoint.x = midPointX;

float midPointY = CGRectGetMidY(self.bounds);
// If too far down...
if (newPoint.y > self.superview.bounds.size.height  - midPointY)
  newPoint.y = self.superview.bounds.size.height - midPointY;
else if (newPoint.y < midPointY)    // If too far up...
  newPoint.y = midPointY;

// Set new center location
self.center = newPoint;
}

问候

Answer 1

对不起，这是迟到的，但万一其他人需要帮助进行此更改，请查看此代码：

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

基本上，您必须将事件设置为在视图的任何位置发生。

我希望这可以帮助那些人^ _ ^

Answer 2

您将必须使UIView *subview自定义类与touchesBegan:等等进行覆盖。然后你需要制作你的UIImageView setUserInteractionEnabled:NO。这样，您的自定义UIView上的任何触摸事件都将由视图控制，您可以随意使用它或它的子视图（UIImageView）。

您的UIView子类必须在其类变量中包含您的UIImageView，以便在触摸事件期间对其进行操作，但这很容易理解。

移动UIImageview with Touches在UIView IOS中的任何位置按下时移动

2 个答案: