拖放而不删除UIButton [英] Drag and drop without removing UIButton

问题描述

我正在iphone应用程序中实现拖放系统。到目前为止，我设法实现可拖动的按钮，它工作正常。这是我的代码：

首先，我将操作分配给按钮：

  [button addTarget：self action：@selector（imageMoved：withEvent :) forControlEvents：UIControlEventTouchDragInside]; 
  

然后，我创建拖动：

   - （IBAction）imageMoved：（id）sender withEvent：（UIEvent *）event 
 {
 NSLog（@moved）; 
 CGPoint point = [[[all allTouches] anyObject] locationInView：self.view]; 
 UIControl * control = sender; 
 control.center = point; 
} 
  

然而，我想要实现的是拖动的按钮不是从它的位置移除。所以我想到一个解决方案是创建一个类似于第一个新的按钮，并移动这个新创建的按钮。但是我在执行这个最后一部分时遇到麻烦。
任何帮助？非常感谢！

解决方案

   - （IBAction）imageMoved：（id）sender withEvent： （UIEvent *）事件{
 NSLog（@moved）; 
 
 CGPoint point = [[[all allTouches] anyObject] locationInView：self.view]; 
 
 if（！[self.view viewWithTag：11]）{
 
 NSData * archivedData = [NSKeyedArchiver archivedDataWithRootObject：（UIButton *）sender]; 
 
 UIButton * anotherButton =（UIButton *）[NSKeyedUnarchiver unarchiveObjectWithData：archivedData]; 
 
 anotherButton.tag = 11; 
 
 
 UIImage * senderImage = [（UIButton *）sender imageForState：UIControlStateNormal]; 
 
 
 
 
 CGImageRef cgImage = [senderImage CGImage]; 
 
 
 UIImage * copyOfImage = [[UIImage alloc] initWithCGImage：cgImage]; 
 
 
 
 [anotherButton setImage：copyOfImage forState：UIControlStateNormal]; 
 
 [self.view addSubview：anotherButton]; 
} 
 
 [self.view viewWithTag：11] .center = point; 
} 
  

I'm implementing a drag and drop system in an iphone app. So far I managed to implement the draggable button and it is working fine. This is the code that I have:

First, I assign the action to the button:

[button addTarget:self action:@selector(imageMoved:withEvent:) forControlEvents:UIControlEventTouchDragInside];

then, I create the drag:

- (IBAction) imageMoved:(id) sender withEvent:(UIEvent *) event
{
    NSLog(@"moved");
    CGPoint point = [[[event allTouches] anyObject] locationInView:self.view];
    UIControl *control = sender;
    control.center = point;
}

However, what I want to achieve is that the button being dragged doesn't gets removed from where it is. So I thought of one solution that is to create a new button similar to the first and move the this newly created button. But I having trouble in implementing this last part. Any help? Thanks very much!

解决方案

- (IBAction) imageMoved:(id) sender withEvent:(UIEvent *) event {
    NSLog(@"moved");          

    CGPoint point = [[[event allTouches] anyObject] locationInView:self.view];

    if (![self.view viewWithTag:11]) {

        NSData *archivedData = [NSKeyedArchiver archivedDataWithRootObject:(UIButton*)sender];                

        UIButton *anotherButton =(UIButton*) [NSKeyedUnarchiver unarchiveObjectWithData:archivedData];

        anotherButton.tag = 11;    


        UIImage *senderImage=[(UIButton *)sender imageForState:UIControlStateNormal];




        CGImageRef cgImage = [senderImage CGImage];


        UIImage *copyOfImage = [[UIImage alloc] initWithCGImage:cgImage];



        [anotherButton setImage:copyOfImage forState:UIControlStateNormal];

        [self.view addSubview:anotherButton];
    }

    [self.view viewWithTag:11].center = point;
}

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