Create a movable view

1. First create a root view controller (introduce header file)

Original code:

 // 设置根视图控制器    MainViewController *mainVC=[[MainViewController alloc] init];    _window.rootViewController =mainVC;    [mainVC release];

2. Create a subclass of MyView UIView in the View Controller (Introduction header file)

Original code:

///创建一个MyView;    MyView *myView=[[MyView alloc] initWithFrame:CGRectMake(10020015040)];    myView.backgroundColor =[UIColor redColor];    [self.view addSubview:myView];    [myView release];

3. Create a method in MyView you can see from the code above:

Touches quite a set click on the equivalent of only one element in the collection

4. Get the initial position in the touch Start Method: (1). Use Touches.count to measure the number of elements in the touches

 NSLog(@"%ld",touches.count);

(2). You can go to this object with Anyobject.

UITouch *touch =[touches anyObject];

(3). Get the current position of the corresponding view by touching the object

selflocationInView:self];   

5. The coordinates of the new point can be obtained in the moving method

-(void) touchesmoved: (Nsset *) touches withevent: (uievent *) event{//By moving, find the changes, and then let the myview also adjust accordingly, so as to achieve the effect of trying to move around    //Get Touch ObjectsUitouch *touch =[touches Anyobject];//Get the coordinates after the move    CgpointMovepoint =[touch Locationinview: Self];//Find coordinates change    CGFloatDX =movepoint. x- Self. StartPoint. x;CGFloatDy =movepoint. Y- Self. StartPoint. Y;//Set the change of movement of the View     Self. Center=cgpointmake ( Self. Center. x+DX, Self. Center. Y+dy); }

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Create a movable view