将MKAnnotationView子类化并覆盖setDragState

问题描述

这是关于使用MKMapKit的iPhone应用程序：

This is about an iPhone App using MKMapKit:

我为可拖动注释创建了一个自定义MKAnnotationView。我想创建一个自定义动画。我设置了一个自定义pin图像，注释是可拖动的（这里都没有显示，它发生在mapview）与以下代码：

I created a custom MKAnnotationView for a draggable Annotation. I want to create a custom animation. I set a custom pin image and the annotation is draggable (which both is not shown here, it happens in the mapview) with the following code:

- (void) movePinUpFinished {

     [super setDragState:MKAnnotationViewDragStateDragging];
     [self setDragState:MKAnnotationViewDragStateDragging];
}

- (void) setDragState:(MKAnnotationViewDragState) myState {
     if (myState == MKAnnotationViewDragStateStarting) {
          NSLog(@"starting");
          CGPoint endPoint = CGPointMake(self.center.x,self.center.y-20);
          self.center = endPoint;
          [self movePinUpFinished];
     }
     if (myState == MKAnnotationViewDragStateEnding) {
          NSLog(@"ending");
          [super setDragState:MKAnnotationViewDragStateEnding];
          [self setDragState:MKAnnotationViewDragStateNone];
          [super setDragState:MKAnnotationViewDragStateNone];
     }
     if (myState == MKAnnotationViewDragStateDragging) {
          NSLog(@"dragging");
     }
     if (myState == MKAnnotationViewDragStateCanceling) {
          NSLog(@"cancel");
     }
     if (myState == MKAnnotationViewDragStateNone) {
          NSLog(@"none");
     }
}

一切正常，注释向上移动，是可拖动的，当我释放注释时，mapview接收dragstateending。

Everything works fine, the annotation is moved up a bit, is draggable and when i release the annotation, the mapview receives the "dragstateending".

但是现在我想让动画在一段时间内运行，并将dragStateStarting更改为如下：

But now I want the animation to run over a time period and change the dragStateStarting to the following:

if (myState == MKAnnotationViewDragStateStarting) {
          NSLog(@"starting");
          CGPoint endPoint = CGPointMake(self.center.x,self.center.y-20);
          [UIView animateWithDuration:1.0
           animations:^{ self.center = endPoint; }
           completion:^(BOOL finished){ [self movePinUpFinished]; }];
     }

动画在一秒钟的时间内运行，注释是可拖动的。但是当我释放注释时，mapview不会通过delegat接收结束。我还认识到，当我做的动画与UIView animateWithDuration ...是在开始拖动后，随着动画开始，注释的气球打开。当我设置新的中心没有动画，气球保持关闭，只有在完成拖动后通过释放注释打开。

The animations runs as wanted over the period of a second and the annotation is draggable. But when I release the annotation, the mapview is not receiving the ending through the delegat. What I also recognized was that when I am doing the animation with "UIView animateWithDuration..." is that immedently after beginning the dragging, as the animation starts, the ballon of the annotation opens. When i am setting the new center without the animation, the balloon keeps closed and is only opened after finishing the dragging by releasing the annotation.

我做错了什么？这是覆盖setDragState的正确方法。我真的要调用超类吗？但是没有在超类中设置dragstate我的mapview没有意识到dragstate的更改。

What am I doing wrong? Is this the right way to override setDragState. Do I really have to call the super class? But without setting the dragstate in the superclass my mapview didnt realized the changes of the dragstate.

我不知道MKPinAnnotationView的原始实现，但因为它是一个内部类找不到setDragState方法的描述。

I wonder about the original implementation of MKPinAnnotationView, but because it is an internal Class I couldn't find a description of the setDragState method.

Thx的帮助。干杯，

Thx for help. Cheers,

本

推荐答案

试图找出为什么当你不重写setDragState - 不再工作在我的实现中发生的pin日志。您的问题包含我的答案..谢谢！

I had the pin drag working but was trying to figure out why the pin annimations that occur when you don't override setDragState - no longer work in my implementation. Your question contained my answer .. Thanks!

您的代码的一部分问题是，一旦你重写了setDragState函数，根据xcode文档，你负责更新基于新状态的dragState变量。我也会对你的代码调用自己有一些担心（setDragState调用[self setDragState]）。

Part of the problem with your code is that once you override the setDragState function, per the xcode documentation, you are responsible for updating the dragState variable based on the new state coming in. I would also be a little concerned about your code calling itself (setDragState calling [self setDragState]).

这里是代码我结束了（与你的帮助），所有的电梯，拖拉和跌落，我希望他们发生。希望这也能帮助你！

Here is the code I ended up (with your help) that does all of the lifts, drags and drops as I expect them to occur. Hope this helps you too!

- (void)setDragState:(MKAnnotationViewDragState)newDragState animated:(BOOL)animated
{
    if (newDragState == MKAnnotationViewDragStateStarting)
    {
        // lift the pin and set the state to dragging

        CGPoint endPoint = CGPointMake(self.center.x,self.center.y-20);
        [UIView animateWithDuration:0.2
                         animations:^{ self.center = endPoint; }
                         completion:^(BOOL finished)
                             { self.dragState = MKAnnotationViewDragStateDragging; }];
    }
    else if (newDragState == MKAnnotationViewDragStateEnding)
    {
        // save the new location, drop the pin, and set state to none

        /* my app specific code to save the new position
        objectObservations[ACTIVE].latitude = pinAnnotation.coordinate.latitude;
        objectObservations[ACTIVE].longitude = pinAnnotation.coordinate.longitude;
        posChanged = TRUE;
        */

        CGPoint endPoint = CGPointMake(self.center.x,self.center.y+20);
        [UIView animateWithDuration:0.2
                         animations:^{ self.center = endPoint; }
                         completion:^(BOOL finished)
                             { self.dragState = MKAnnotationViewDragStateNone; }];
    }
    else if (newDragState == MKAnnotationViewDragStateCanceling)
    {
        // drop the pin and set the state to none

        CGPoint endPoint = CGPointMake(self.center.x,self.center.y+20);
        [UIView animateWithDuration:0.2
                         animations:^{ self.center = endPoint; }
                         completion:^(BOOL finished)
                             { self.dragState = MKAnnotationViewDragStateNone; }];
    }
}

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