[翻译] UIView-draggable 可拖拽的UIView

UIView-draggable 可拖拽的UIView

https://github.com/andreamazz/UIView-draggable

UIView category that adds dragging capabilities

一个类目用来给UIView便利的添加拖拽手势

Setup with Cocoapods 用Cocoapods设置

• Add pod 'UIView+draggable' to your Podfile
• Run pod install
• Run open App.xcworkspace
• Import UIVIew+draggable.h in your controller's header file

Usage 使用

// Enable dragging

[self.view enableDragging];

TODO

• Write the README :)

 

UIView+draggable.h

//

//  UIView+draggable.h

//  UIView+draggable

//

//  Created by Andrea on 13/03/14.

//  Copyright (c) 2014 Fancy Pixel. All rights reserved.

//



@interface UIView (draggable)



/**-----------------------------------------------------------------------------

 * @name UIView+draggable Properties

 * -----------------------------------------------------------------------------

 */



/** The pan gestures that handles the view dragging

 *

 * @param panGesture The tint color of the blurred view. Set to nil to reset.

 */

@property (nonatomic) UIPanGestureRecognizer *panGesture;



/**-----------------------------------------------------------------------------

 * @name UIView+draggable Methods

 * -----------------------------------------------------------------------------

 */



/** Enables the dragging

 *

 * Enables the dragging state of the view

 */

- (void)enableDragging;



/** Disable or enable the view dragging

 *

 * @param draggable The boolean that enables or disables the draggable state

 */

- (void)setDraggable:(BOOL)draggable;



@end

UIView+draggable.m

//

//  UIView+draggable.m

//  UIView+draggable

//

//  Created by Andrea on 13/03/14.

//  Copyright (c) 2014 Fancy Pixel. All rights reserved.

//



#import "UIView+draggable.h"

#import <objc/runtime.h>



@implementation UIView (draggable)



- (void)setPanGesture:(UIPanGestureRecognizer*)panGesture

{

    objc_setAssociatedObject(self, @selector(panGesture), panGesture, OBJC_ASSOCIATION_RETAIN);

}



- (UIPanGestureRecognizer*)panGesture

{

    return objc_getAssociatedObject(self, @selector(panGesture));

}



- (void)handlePan:(UIPanGestureRecognizer*)sender

{

    [self adjustAnchorPointForGestureRecognizer:sender];



    CGPoint translation = [sender translationInView:[self superview]];

    [self setCenter:CGPointMake([self center].x + translation.x, [self center].y + translation.y)];



    [sender setTranslation:(CGPoint){0, 0} inView:[self superview]];

}



- (void)adjustAnchorPointForGestureRecognizer:(UIGestureRecognizer *)gestureRecognizer

{

    if (gestureRecognizer.state == UIGestureRecognizerStateBegan) {

        UIView *piece = self;

        CGPoint locationInView = [gestureRecognizer locationInView:piece];

        CGPoint locationInSuperview = [gestureRecognizer locationInView:piece.superview];

        

        piece.layer.anchorPoint = CGPointMake(locationInView.x / piece.bounds.size.width, locationInView.y / piece.bounds.size.height);

        piece.center = locationInSuperview;

    }

}



- (void)setDraggable:(BOOL)draggable

{

    [self.panGesture setEnabled:draggable];

}



- (void)enableDragging

{

    self.panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePan:)];

    [self.panGesture setMaximumNumberOfTouches:1];

    [self.panGesture setMinimumNumberOfTouches:1];

    [self.panGesture setCancelsTouchesInView:NO];

    [self addGestureRecognizer:self.panGesture];

}



@end