01.轮播图之五 :一个 imageView也能 作 轮播
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这个是最近才写的,本以为实现起来很有难度,需要更高深的理论,
写完之后,才发现自己错误的离谱;
之所以能用一个imageview 实现轮播 基于两点:::
- 使用 imageview 的layer 层设置,也就是动用的是imageview的重新绘制---- 这个是视图切换的原因
- 使用 CATransition 动画 ------ 这个动画模拟了轮播的效果
就是简单:::
.h 的声明
@interface ImageViewShuffling : UIView @property (nonatomic,strong)NSArray *array; @end
.m 实现,和理论解释
@interface ImageViewShuffling () @property (nonatomic,strong)UIImageView *imageView; @property (nonatomic,assign)NSInteger currentIndex; @end @implementation ImageViewShuffling @synthesize array = _array; -(instancetype)initWithFrame:(CGRect)frame{ if (self == [super initWithFrame:frame]) { [self addSubview:self.imageView]; } return self; } -(void)setArray:(NSArray *)array{ NSAssert(array.count != 0, @"传入的滚动数组是 空的"); _array = array; self.imageView.backgroundColor = array.firstObject; } -(UIImageView *)imageView{ if (_imageView == nil) { _imageView =[[UIImageView alloc]initWithFrame:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)]; _imageView.contentMode = UIViewContentModeScaleAspectFit; _imageView.userInteractionEnabled = YES; /*
imageview 添加左右滑动的手势
*/ UISwipeGestureRecognizer *left = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(leftSwifAction:)]; left.direction = UISwipeGestureRecognizerDirectionLeft; [_imageView addGestureRecognizer:left]; UISwipeGestureRecognizer *right = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(rigthSwifAction:)]; right.direction = UISwipeGestureRecognizerDirectionRight; [_imageView addGestureRecognizer:right]; } return _imageView; }
/*
根据手势判断 左右的滑动 判断 显示的index
*/ -(void)rigthSwifAction:(UISwipeGestureRecognizer*)swip{ self.currentIndex = (self.currentIndex+1) % (self.array.count); [self changeImageWithIndex:self.currentIndex andDirection:@"right"]; } -(void)leftSwifAction:(UISwipeGestureRecognizer*)swip{ self.currentIndex = (self.currentIndex - 1 + self.array.count)%(self.array.count); [self changeImageWithIndex:self.currentIndex andDirection:@"left"]; }
/*
这个是唯一的重点::
使用 CATransition 添加动画
*/ -(void)changeImageWithIndex:(NSInteger)integer andDirection:(NSString*)direction{ self.imageView.backgroundColor = self.array[integer]; CATransition *transition = [[CATransition alloc]init]; transition.type = kCATransitionPush; if ([direction isEqualToString:@"right"]) { transition.subtype = kCATransitionFromLeft; }else{// if left transition.subtype = kCATransitionFromRight; } [self.imageView.layer addAnimation:transition forKey:@"direction"]; }
有木有发现,这个实现很简单呀…………
主要是CATransition 动画的功劳…………
调用:::
-(void)prepareImageViewShuffling{ ImageViewShuffling *imageViewShuffling = [[ImageViewShuffling alloc]initWithFrame:CGRectMake(10, 450, self.view.frame.size.width -20, 220)]; [self.view addSubview:imageViewShuffling];; imageViewShuffling.array = self.arr; }
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