iphone – 如何实现连续拖放菜单效果？

概述我正在尝试实现拖放菜单效果.我不知道如何解决这个问题,也许有人有这种确切影响的经验. 很简单,当用户触摸菜单项时,我希望在他们的触摸位置显示图形.他们的触摸现在将控制图形的平移.在释放触摸后,图形将位于其位置并呈现完整的alpha. 我已经熟悉创建平移手势和实例化图形.到目前为止,我可以创建触摸菜单项的图形.最大的问题是我如何“越过”触摸手势,这是一个单一的连续动作. 此外,菜单项应该是UIBut 我正在尝试实现拖放菜单效果.我不知道如何解决这个问题,也许有人有这种确切影响的经验.

很简单,当用户触摸菜单项时,我希望在他们的触摸位置显示图形.他们的触摸现在将控制图形的平移.在释放触摸后,图形将位于其位置并呈现完整的Alpha.

我已经熟悉创建平移手势和实例化图形.到目前为止,我可以创建触摸菜单项的图形.最大的问题是我如何“越过”触摸手势,这是一个单一的连续动作.

此外,菜单项应该是UIbutton还是UIImageVIEw？

任何帮助赞赏.谢谢

解决方法 我对这个玩得很开心.以下代码将在触摸时从按钮中抓取图像,将该图像拖动到Alpha = 0.5,并在您的触摸以Alpha = 1.0结束时将其放下.此后它将继续拖延.

导入QuartzCore后,创建一个新文件. .h应该是：

#import <Foundation/Foundation.h>#import <QuartzCore/CAGradIEntLayer.h>#import <QuartzCore/CALayer.h>@interface DraggableImage : CAGradIEntLayer- (voID)draw:(UIImage *)image;- (voID)movetoFront;- (voID)appearDraggable;- (voID)appearnormal;@end

并且.m应该是：

#import "DraggableImage.h"@implementation DraggableImage- (voID)draw:(UIImage *)image{    CGRect buttonFrame = self.bounds;    int buttonWIDth = buttonFrame.size.wIDth;    int buttonHeight = buttonFrame.size.height;    UIGraphicsBeginImageContext( CGSizeMake(buttonWIDth,buttonHeight) );    [image drawInRect:self.bounds];    UIImage* newImage = UIGraphicsGetimageFromCurrentimageContext();    UIGraphicsEndImageContext();    [newImage drawInRect:self.bounds];}- (voID)movetoFront {    CALayer *superlayer = self.superlayer;    [self removeFromSuperlayer];    [superlayer addSublayer:self];}- (voID)appearDraggable {    self.opacity = 0.5;}- (voID)appearnormal {    self.opacity = 1.0;}@end

现在在主视图控制器中,添加：

#import <UIKit/UIKit.h>#import <QuartzCore/QuartzCore.h>#import "DraggableImage.h"@interface YourVIEwController : UIVIEwController{    DraggableImage *heldImage;    DraggableImage *imageForFrame[5]; // or however many    UIbutton *button@R_502_4848@;    int imageCount;}@property (weak,nonatomic) IBOutlet UIbutton *imagebutton;-(IBAction)buildImageLayerForbutton:(UIbutton *)sender;- (voID)moveHeldImagetoPoint:(CGPoint)location;- (CALayer *)layerFortouch:(UItouch *)touch;

在这种情况下,imagebutton将是你的苹果按钮.现在在.m文件中,添加以下内容：

@synthesize imagebutton;#pragma - mark touches-(voID)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{    CALayer *hitLayer = [self layerFortouch:[touches anyObject]];    if ([hitLayer isKindOfClass:[DraggableImage class]]) {        DraggableImage *image = (DraggableImage *)hitLayer;        heldImage = image;        [heldImage movetoFront];    }    hitLayer = nil;    [super touchesBegan:touches withEvent:event];}-(voID)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{        if (heldImage)         {            UItouch *touch = [touches anyObject];            UIVIEw *vIEw = self.vIEw;            CGPoint location = [touch locationInVIEw:vIEw];            [self moveHeldImagetoPoint:location];        }}- (voID) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{    if (heldImage) {        [heldImage appearnormal];        heldImage = nil;    }}- (voID)dragBegan:(UIControl *)c withEvent:ev {}- (voID)dragMoving:(UIControl *)c withEvent:ev {    UItouch *touch = [[ev alltouches] anyObject];    CGPoint touchPoint = [touch locationInVIEw:self.vIEw];    [self moveHeldImagetoPoint:touchPoint];}- (voID)dragEnded:(UIControl *)c withEvent:ev {    UItouch *touch = [[ev alltouches] anyObject];    CGPoint touchPoint = [touch locationInVIEw:self.vIEw];    [self moveHeldImagetoPoint:touchPoint];    [heldImage appearnormal];    heldImage = nil;}-(IBAction)buildImageLayerForbutton:(UIbutton *)sender{        DraggableImage *image = [[DraggableImage alloc] init];        button@R_502_4848@ = sender;        CGRect buttonFrame = sender.bounds;        int buttonWIDth = buttonFrame.size.wIDth;        int buttonHeight = buttonFrame.size.height;        image.frame = CGRectMake(120,24,buttonWIDth*3,buttonHeight*3);        image.backgroundcolor = [UIcolor lightGraycolor].CGcolor;        image.delegate = self;        imageForFrame[imageCount] = image;        [self.vIEw.layer addSublayer:image];        [image setNeedsdisplay];        [image movetoFront];        [image appearDraggable];        heldImage = image;        [self moveHeldImagetoPoint:sender.center];        imageCount++;}- (voID)drawLayer:(CALayer *)layer inContext:(CGContextRef)ctx {    UIGraphicsPushContext(ctx);    DraggableImage *image = (DraggableImage *)layer;    [image draw:[button@R_502_4848@ imageForState:UIControlStatenormal]];    UIGraphicsPopContext();}- (voID)moveHeldImagetoPoint:(CGPoint)location {    float dx = location.x;    float dy = location.y;    CGPoint newposition = CGPointMake(dx,dy);    [CATransaction begin];    [CATransaction setdisableActions:TRUE];    heldImage.position = newposition;    [CATransaction commit];}- (CALayer *)layerFortouch:(UItouch *)touch {    UIVIEw *vIEw = self.vIEw;    CGPoint location = [touch locationInVIEw:vIEw];    location = [vIEw convertPoint:location toVIEw:nil];    CALayer *hitPresentationLayer = [vIEw.layer.presentationLayer hitTest:location];    if (hitPresentationLayer)     {        return hitPresentationLayer.modelLayer;    }    return nil;}-(voID)vIEwDIDLoad{    [imagebutton addTarget:self action:@selector(dragBegan:withEvent:) forControlEvents: UIControlEventtouchDown];    [imagebutton addTarget:self action:@selector(dragMoving:withEvent:) forControlEvents: UIControlEventtouchDragInsIDe | UIControlEventtouchDragOutsIDe];    [imagebutton addTarget:self action:@selector(dragEnded:withEvent:) forControlEvents: UIControlEventtouchUpInsIDe | UIControlEventtouchUpOutsIDe];    [super vIEwDIDLoad];}- (voID)vIEwDIDUnload {    [self setimagebutton:nil];    [super vIEwDIDUnload];}

瞧瞧！连接您的按钮,设置其图像,并在整个屏幕上投放副本. 总结

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