标签:动画 技术 blog options back 时间 tee uiimage net
前沿 :
最近重新做了一个手势的demo,其中有“点击”,“长按”,“旋转”,“拉升”等等在这里就不过多说明了,这些手势都是我们手机上经常会用到的功能,所这部分内容还是比较重要的废话也不多说了-上代码。有些同样的代码小编只会写一遍注释。
等等---我忘记说了,在上代码之前我们先看看小编的Assets.xcassets中的内容,这个里面放的都是图片
现在如上面2张图片可以看出在Assets.xcassets中 有23张图片,有人会问要这么多图片有什么用,其是也没什么用处,小编在这里只是想实现一个动画效果而已,那么在这里可以为大家普及一下知识。在我们所看到的动画效果中,其实就是一张张图片在不停切换,只不过速度太快了,我们的肉眼识别不出来而已,所以感觉就是在动。小编早这里就是想实现一个人在不停地奔跑的动画效果,所以有23张图片,当然你只要一张图片也行。------咱们的标贴叫“手势与动画效果”,总得带点动画吧??。
----感觉说的有点多了,下面正式上代码。
在viewcontroller.m中
@interface ViewController ()<UIGestureRecognizerDelegate> @property (nonatomic,strong) UIImageView *imageview; @end
创建一个UIImageView对象,作用是放图片。
首先我们要添加一个UIGestureRecognizerDelegate这个委托协议,我们要用到它的一个委托方法,
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
这个委托方法的作用就是检测你的手势,打个比方来说:有个拖动的手势和一个滑动的手势,那么怎么区分开来我是拖动还是滑动呢,这时就需要这个检测方法来进行判断了。
//遵守UIGestureRecognizerDelegate协议,作用是检测手势 -(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{ if ([gestureRecognizer isKindOfClass:[UIPinchGestureRecognizer class]] && [otherGestureRecognizer isKindOfClass:[UIRotationGestureRecognizer class]]) { return YES; } return NO; }
以上是这个检测方法的实现代码。
- (void)viewDidLoad { [super viewDidLoad]; //定义view的背景颜色 self.view.backgroundColor=[UIColor redColor]; //创建一个数组来放图片 NSMutableArray *imageArray=[NSMutableArray arrayWithCapacity:0]; //把Assets.xcassets的图片全部放入这个数字中 imageArray=[NSMutableArray arrayWithObjects: [UIImage imageNamed:@"timg-1"],[UIImage imageNamed:@"timg-2"], [UIImage imageNamed:@"timg-3"],[UIImage imageNamed:@"timg-4"], [UIImage imageNamed:@"timg-5"],[UIImage imageNamed:@"timg-6"], [UIImage imageNamed:@"timg-7"],[UIImage imageNamed:@"timg-8"], [UIImage imageNamed:@"timg-9"],[UIImage imageNamed:@"timg-10"], [UIImage imageNamed:@"timg-11"],[UIImage imageNamed:@"timg-12"], [UIImage imageNamed:@"timg-13"],[UIImage imageNamed:@"timg-14"], [UIImage imageNamed:@"timg-15"],[UIImage imageNamed:@"timg-16"], [UIImage imageNamed:@"timg-17"],[UIImage imageNamed:@"timg-18"], [UIImage imageNamed:@"timg-19"],[UIImage imageNamed:@"timg-20"], [UIImage imageNamed:@"timg-21"],[UIImage imageNamed:@"timg-22"], [UIImage imageNamed:@"timg-23"], nil ]; //设置UIimageView的坐标与大小(宽高) imageview=[[UIImageView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)]; //设置在UIimageView中第一张图片是数组的第一个对象 imageview.image=[imageArray firstObject]; //设置动画效果 imageview.animationImages=imageArray; //设置播放速度0.0f-1.0f 1为正常速度,越小速度越快 imageview.animationDuration=0.2f; //设置图片可以编辑(在下面的一些手势需要) imageview.userInteractionEnabled=YES; //开始播放 [imageview startAnimating]; //在view中添加一个UIimageVIew [self.view addSubview:imageview]; //手势 [self Gesture]; // Do any additional setup after loading the view, typically from a nib. }
在这小编先解释一下,我们设置的view背景颜色为红色,但是根本没有红色,那是因为view被UIImageView给挡了,
imageview=[[UIImageView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
这里小编把 UIImageView的宽高设置为和view的宽高一样大小。别急等下面我们讲解手势的时候,比如拖动,缩放等,就可以看到view了
这串代码小编就不多说了,每一行都有注视说明,到了这一步小编的动画效果就出来了:
怎么说呢,小编其实是想做一个GIF图的,可是在其他电脑上加载不出来,不知道是不是太大的缘故,哎!!没办法小编就发3张图片给大家凑合凑合吧。
手势小知识:
UIGestureRecognizer将一些和手势操作相关的方法抽象了出来,但它本身并不实现什么手势我们也不会用到他,所以在开发中过程中,我们一般不会直接使用UIGestureRecognizer的对象,而是通过其子类进行实例化并实现手势的功能。以下是几种手势
UITapGestureRecognizer 点击手势
UIPinchGestureRecognizer 缩放手势
UIRotationGestureRecognizer 旋转手势
UISwipeGestureRecognizer 滑动手势
UIPanGestureRecognizer 拖动手势
UILongPressGestureRecognizer 长按手势
一下是手势的代码:
1)点击一下
UITapGestureRecognizer *TapGestureRecognizer=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(TapGesture:)]; //设置手指的个数为1个 TapGestureRecognizer.numberOfTouchesRequired=1; //遵守UIGestureRecognizerDelegate协议 TapGestureRecognizer.delegate=self; //添加这个手势到UIimageView中 [imageview addGestureRecognizer:TapGestureRecognizer];
-(void)TapGesture:(UITapGestureRecognizer *)Tap{ NSLog(@"Tap------>%@",Tap); //判断UIimageView是否在动画中 if (imageview.isAnimating) { [imageview stopAnimating]; }else{ [imageview startAnimating]; } // if (Tap.state==UIGestureRecognizerStateEnded) { // [UIView animateWithDuration:1 delay:0 options:UIViewAnimationOptionCurveEaseOut animations:^{ // CGPoint point=self.view.center; // // Tap.view.center =CGPointMake(point.x, point.y-100) ; // // } completion:nil]; // // // [UIView animateWithDuration:1 delay:1 options:UIViewAnimationOptionCurveEaseOut animations:^{ // CGPoint point=self.view.center; // // Tap.view.center =CGPointMake(point.x, point.y+100); // CGPoint oo=CGPointMake(point.x, point.y+100); // } // // } completion:nil]; // } }
numberOfTouchesRequired // 手指数量个数;
numberOfTapsRequired // 连续轻拍次数;
-(void)TapGesture:(UITapGestureRecognizer *)Tap这个方法是自定义的,主要实现点击后的效果,在这方中有一大串注释过的代码,其实就是实现一个动作效果而已,可以忽略,当然有兴趣的可以去掉注释,看看效果。这串代码很少,其实就是一个判断是否在动画而已。
2)拖动效果
UIPanGestureRecognizer *PanGestureRecognizer=[[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(PanGesture:)]; PanGestureRecognizer.delegate=self; [imageview addGestureRecognizer:PanGestureRecognizer];
-(void)PanGesture:(UIPanGestureRecognizer *)Pan{ NSLog(@"Pan------>%@",Pan); //view上可以放控件,那么这个view就是这些控件的superView.而UIWindow上可以叠一层又一层的view,UIWindow就是这些view的superView.先放上去的index为0,然后依次累加 CGPoint point=[Pan translationInView:Pan.view.superview]; //中心点 CGPoint center=imageview.center; //设置中心坐标(x,y) center.x=center.x+point.x; center.y=center.y+point.y; imageview.center=center; [Pan setTranslation:CGPointZero inView:Pan.view]; //拖动结束后执行 if(Pan.state==UIGestureRecognizerStateEnded){ // imageview.center=self.view.center; // CGPoint velocity = [Pan velocityInView:self.view]; // CGFloat magnitude = sqrtf((velocity.x * velocity.x) + (velocity.y * velocity.y)); // CGFloat slideMult = magnitude / 200; // NSLog(@"magnitude: %f, slideMult: %f", magnitude, slideMult); // // float slideFactor = 0.1 * slideMult; // Increase for more of a slide // CGPoint finalPoint = CGPointMake(Pan.view.center.x + (velocity.x * slideFactor), // Pan.view.center.y + (velocity.y * slideFactor)); // finalPoint.x = MIN(MAX(finalPoint.x, 0), self.view.bounds.size.width); // finalPoint.y = MIN(MAX(finalPoint.y, 0), self.view.bounds.size.height); // [UIView animateWithDuration:1 delay:0 options:UIViewAnimationOptionCurveEaseOut animations:^{ Pan.view.center = self.view.center; } completion:nil]; } }
[Pan setTranslation:CGPointZero inView:Pan.view];这个方法网上介绍的很少,我总结了一下大概意思就是:清空(把Translation置零)移动的距离,有的解释为“复位”,复位的意思就是归零, 也可以叫初始化
UIGestureRecognizerStateEnded 拖动手势结束后
[UIView animateWithDuration:1 delay:0 options:UIViewAnimationOptionCurveEaseOut animations:^{
Pan.view.center = self.view.center;
} completion:nil];
以动画的效果回到view 的终点。
3)上下滑效果
//向上滑动 UISwipeGestureRecognizer *SwipeGestureRecognizerUP=[[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(SwipeGestureUP:)]; SwipeGestureRecognizerUP.delegate=self; //上滑动 SwipeGestureRecognizerUP.direction=UISwipeGestureRecognizerDirectionUp; [imageview addGestureRecognizer:SwipeGestureRecognizerUP]; //向下滑动 UISwipeGestureRecognizer *SwipeGestureRecognizerDOWN=[[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(SwipeGestureDOWN:)]; SwipeGestureRecognizerDOWN.delegate=self; //下滑动 SwipeGestureRecognizerDOWN.direction=UISwipeGestureRecognizerDirectionDown; [imageview addGestureRecognizer:SwipeGestureRecognizerDOWN];
滑动分上滑动和下滑动,这里为了好看,我一起发了出来
typedef enum { UISwipeGestureRecognizerDirectionRight = 1 << 0, UISwipeGestureRecognizerDirectionLeft = 1 << 1, UISwipeGestureRecognizerDirectionUp = 1 << 2, } UISwipeGestureRecognizerDirection;
这是一个枚举类型,滑动可以上下左右,这里我只区分了上下滑动
//向上滑动的效果 -(void)SwipeGestureUP:(UISwipeGestureRecognizer *)UP{ NSLog(@"UP------>%@",UP); //动画的速度 float Duration=imageview.animationDuration; Duration=Duration-0.1; //判断是否小于0 if (Duration<0) { Duration=0.1; } if (imageview.isAnimating) { //把新的动画速度给UIimageView imageview.animationDuration=Duration; [imageview startAnimating]; }else{ imageview.animationDuration=Duration; } } //向下滑动的效果 -(void)SwipeGestureDOWN:(UISwipeGestureRecognizer *)DOWN{ NSLog(@"DOWN------>%@",DOWN); float Duration=imageview.animationDuration; Duration=Duration+0.1; if (Duration>1.0) { Duration=1.0; } if (imageview.isAnimating) { imageview.animationDuration=Duration; [imageview startAnimating]; }else{ imageview.animationDuration=Duration; } }
imageview.animationDuration设置动画速度,上滑动就是加速度,下滑动就是减速度。然后重新复制给imageview.animationDuration来改变动画的速度。
4)长按效果
UILongPressGestureRecognizer *LongPressGestureRecognizer=[[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(LongPressGesture:)]; //长安时间为0.5秒 LongPressGestureRecognizer.minimumPressDuration=0.5f; LongPressGestureRecognizer.delegate=self; [imageview addGestureRecognizer:LongPressGestureRecognizer];
//长按的效果 -(void)LongPressGesture:(UILongPressGestureRecognizer *)LongPress{ NSLog(@"LongPress------>%@",LongPress); //LongPress.allowableMovement = 10; }
minimumPressDuration: 长按生效时间
allowableMovement: 长按有效移动范围(从点击开始,长按移动的允许范围)
5)放大缩小效果
UIPinchGestureRecognizer *PinchGestureRecognizer=[[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(PinchGesture:)]; PinchGestureRecognizer.delegate=self; [imageview addGestureRecognizer:PinchGestureRecognizer];
//放大缩小的效果 -(void)PinchGesture:(UIPinchGestureRecognizer *)Pinch{ NSLog(@"Pinch------>%@",Pinch); imageview.transform=CGAffineTransformScale(imageview.transform, Pinch.scale, Pinch.scale); Pinch.scale=1; }
CGAffineTransformScale缩放:设置缩放比例
scale缩放比例(手指距离增大,scale增大) // scale = 1.0
以下是效果图
6)旋转效果
UIRotationGestureRecognizer *RotationGestureRecognizer=[[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(RotationGesture:)]; RotationGestureRecognizer.delegate=self; [imageview addGestureRecognizer:RotationGestureRecognizer];
-(void)RotationGesture:(UIRotationGestureRecognizer *)Rotation{ NSLog(@"Rotation------>%@",Rotation); imageview.transform=CGAffineTransformRotate(imageview.transform, Rotation.rotation); Rotation.rotation=0; }
CGAffineTransformMakeRotation 旋转:设置旋转角度
velocity :速度
rotation 旋转的弧度
Rotation.rotation = 0;
将旋转的弧度清0(将当前手势旋转的弧度清0);
-----------------------------------------------------目前几个手势的功能就基本实现了,希望我的笔记可以帮打你们
一下是效果图
标签:动画 技术 blog options back 时间 tee uiimage net
原文地址:http://www.cnblogs.com/312294025myj/p/6736079.html