续上次写了一个三张图片实现无限轮播之后，发现轮播类型单一，此次新增一种缩放式轮播，后续若发现有新的轮播方式将会继续更新，代码如下：
#import <UIKit/UIKit.h>
/** 方向*/
typedef enum : NSUInteger {
// 不 自 动 循 环(即不开启定时器)
ZJLoopScrollDirectionNone = 0,
// 从 右 往 左 自 动 循 环
ZJLoopScrollDirectionRightToLeft = 1,
// 从 左 往 右 自 动 循 环
ZJLoopScrollDirectionLeftToRight = 2,
} ZJLoopScrollDirection;
/** 样式*/
typedef enum : NSUInteger {
// 默 认 平 滑
ZJLoopScrollStyleNone = 0,
// 缩 放 动 画
ZJLoopScrollStyleZoom = 1,
} ZJLoopScrollStyle;
/** 样式*/
@class ZJLoopScrollView;
@protocol ZJLoopScrollViewDelegate <NSObject>
@optional
/** 点击时当前显示*/
-(void)scrollView:(ZJLoopScrollView*)scrollView didSelectSubviewAtIndex:(NSInteger)index;
/** 停止时当前显示*/
-(void)scrollView:(ZJLoopScrollView*)scrollView didEndDeceleratingAtIndex:(NSInteger)index;
@end
/** 图片无限循环*/
@interface ZJLoopScrollView : UIView
@property(nonatomic,weak) id<ZJLoopScrollViewDelegate> delegate;
@property(nonatomic,assign) ZJLoopScrollDirection scrollDirection;
@property(nonatomic,assign) ZJLoopScrollStyle scrollStyle;
- (void)showImagesWithImageStrs:(NSArray<NSString*>*)imageStrs;
- (void)showDefaultCurrentIndex:(NSInteger)currentIndex;
/** 回调方法*/
- (void)didSelectSubviewAtIndex:(void(^)(NSInteger index))block;
- (void)didEndDeceleratingAtIndex:(void(^)(NSInteger index))block;
@end
#import "ZJLoopScrollView.h"
@interface ZJLoopScrollView ()<UIScrollViewDelegate>
@property(nonatomic,strong) NSMutableArray <NSString*>* imageStrs;
@property(nonatomic,assign) NSInteger currentIndex;
@property(nonatomic,weak) UIScrollView * scrollview;
@property(nonatomic,weak) UIImageView * leftImgView;
@property(nonatomic,weak) UIImageView * centerImgView;
@property(nonatomic,weak) UIImageView * rightImgView;
@property(nonatomic,strong) dispatch_source_t timer;;
@property(nonatomic,copy) void(^didSelectSubviewAtIndexBlock)(NSInteger index);
@property(nonatomic,copy) void(^didEndDeceleratingAtIndexBlock)(NSInteger index);
@end
@implementation ZJLoopScrollView
- (instancetype)initWithFrame:(CGRect)frame{
self = [super initWithFrame:frame];
if (self) {
[self setSubViews];
}
return self;
}
-(void)setSubViews{
CGRect subframe = CGRectMake(0, 0, CGRectGetWidth([self frame]), CGRectGetHeight([self frame]));
UIScrollView * scroll = [[UIScrollView alloc] initWithFrame:subframe];
[scroll setBounces:false];
[scroll setPagingEnabled:true];
[scroll setShowsVerticalScrollIndicator:false];
[scroll setShowsHorizontalScrollIndicator:false];
[scroll setHidden:true];
[self addSubview:scroll];
[self setScrollview:scroll];
for(int i=0;i<3;i++){
CGRect subframe = CGRectMake(CGRectGetWidth([scroll frame])*i, 0, CGRectGetWidth([scroll frame]), CGRectGetHeight([scroll frame]));
UIImageView * subview01 = [[UIImageView alloc] initWithFrame:subframe];
[subview01 setContentMode:UIViewContentModeScaleAspectFit];
CGFloat arcNum = arc4random_uniform(255)/255.0;
UIColor * color = [UIColor colorWithRed:arcNum green:arcNum blue:arcNum alpha:1];
[subview01 setBackgroundColor:color];
[scroll addSubview:subview01];
if(i==0){[self setLeftImgView:subview01];}
if(i==1){[self setCenterImgView:subview01];}
if(i==2){[self setRightImgView:subview01];}
}
[scroll bringSubviewToFront:[self leftImgView]];
[scroll sendSubviewToBack:[self rightImgView]];
UITapGestureRecognizer * tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapClick)];
[self addGestureRecognizer:tap];
}
-(void)tapClick{
if([self delegate] && [[self delegate] respondsToSelector:@selector(scrollView:didSelectSubviewAtIndex:)]){
[[self delegate] scrollView:self didSelectSubviewAtIndex:[self currentIndex]];
}
if([self didSelectSubviewAtIndexBlock]){
self.didSelectSubviewAtIndexBlock([self currentIndex]);
}
}
-(void)refreshScrollImagesLayoutWithImageStrs:(NSArray*)imageStrs{
if(imageStrs.count<1){return;}
[[self scrollview] setHidden:false];
[self setImageStrs:[NSMutableArray arrayWithArray:imageStrs]];
[self setCurrentIndex:0];
if([imageStrs count]==0){
[[self scrollview] setDelegate:nil];
}else if([imageStrs count] ==1){
[[self scrollview] setDelegate:nil];
}else{
[[self scrollview] setDelegate:self];
[[self scrollview] setContentSize:CGSizeMake(CGRectGetWidth([self frame])*3, 0)];
[[self scrollview] setContentOffset:CGPointMake(CGRectGetWidth([self frame]), 0)];
}
}
#pragma mark - UIScrollViewDelegate
-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
[self refrshScrollImageViewAndCurrentIndex];
}
-(void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView{
[self refrshScrollImageViewAndCurrentIndex];
}
//开始拖动的时候调用
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{
[self cancelTimer];
}
//结束拖动时调用
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{
[self openTimer];
}
#pragma mark -
-(void)refrshScrollImageViewAndCurrentIndex{
[self handleSubImageViewOriginalFrame];
// 计算索引
CGFloat offetIndex = [[self scrollview] contentOffset].x/CGRectGetWidth([[self scrollview] frame]);
if(offetIndex == 1){return;}
if(offetIndex>1){// 右往左滑+1
[self setCurrentIndex:[self currentIndex]+1];
if([self currentIndex]>=[[self imageStrs] count]){
// 确保索引范围
[self setCurrentIndex:0];
}
}else if(offetIndex<1){// 左往右滑-1
[self setCurrentIndex:[self currentIndex]-1];
if([self currentIndex] <= -1){
// 确保索引范围
[self setCurrentIndex:[[self imageStrs] count]-1];
}
}
// 更新UIImage
[self refrshScrollImageViewForImage];
// 保证中心位置
[[self scrollview] setContentOffset:CGPointMake(CGRectGetWidth([[self scrollview] frame]), 0)];
// 回调
if([self didEndDeceleratingAtIndexBlock]){
self.didEndDeceleratingAtIndexBlock([self currentIndex]);
}
if([self delegate] && [[self delegate] respondsToSelector:@selector(scrollView:didEndDeceleratingAtIndex:)]){
[[self delegate] scrollView:self didEndDeceleratingAtIndex:[self currentIndex]];
}
}
-(void)handleLeftImageViewWithIndex:(NSInteger)index{
if(index<= -1){
[self imageView:[self leftImgView] imageString:[[self imageStrs] lastObject]];
}else if(index<=[[self imageStrs] count]-1){
[self imageView:[self leftImgView] imageString:[[self imageStrs] objectAtIndex:index]];
}
}
-(void)handleCenterImageViewWithIndex:(NSInteger)index{
if(index<[[self imageStrs] count]){
[self imageView:[self centerImgView] imageString:[[self imageStrs] objectAtIndex:index]];
}
}
-(void)handleRightImageViewWithIndex:(NSInteger)index{
if(index>=[[self imageStrs] count]){
[self imageView:[self rightImgView] imageString:[[self imageStrs] firstObject]];
}else if(index>=0){
[self imageView:[self rightImgView] imageString:[[self imageStrs] objectAtIndex:index]];
}
}
// 更新UIImage
- (void)refrshScrollImageViewForImage{
[self handleLeftImageViewWithIndex:[self currentIndex]-1];
[self handleCenterImageViewWithIndex:[self currentIndex]];
[self handleRightImageViewWithIndex:[self currentIndex]+1];
}
-(void)imageView:(UIImageView*)imgView imageString:(NSString*)string{
if([UIImage imageNamed:string]){ // 本地图片名称
[imgView setImage:[UIImage imageNamed:string]];
}else if([UIImage imageWithContentsOfFile:string]){// 本地图片路径
//[imgView setImage:[UIImage imageWithContentsOfFile:string]];
}else{ // 网络图片
}
}
#pragma mark - ZJLoopScrollStyleZoom
- (void)scrollViewDidScroll:(UIScrollView *)scrollView{
if([self scrollStyle] && [self scrollStyle] == ZJLoopScrollStyleZoom){
[self handleSubImageViewFrameWith:[scrollView contentOffset].x];
}
}
- (void)handleSubImageViewFrameWith:(CGFloat)offset{
@autoreleasepool {
CGSize size = self.frame.size;
CGFloat scale = 0.6;
if(offset>CGRectGetWidth([self frame])){// 从右往左
CGRect subFrame = CGRectMake(0, 0, size.width*scale, 0);
CGPoint center = CGPointMake(size.width*0.5+offset, size.height*0.5);
subFrame.size.width += (offset-size.width*1.0)*(1-scale);
subFrame.size.height = size.height*subFrame.size.width/size.width;
[[self rightImgView] setFrame:subFrame];
[[self rightImgView] setCenter:center];
[[self leftImgView] setCenter:CGPointMake(size.width*0.5, size.height*0.5)];
}else{ // 从左往右
CGRect subFrame = CGRectMake(0, 0, size.width, size.height);
CGPoint center = CGPointMake(size.width*0.5+offset, size.height*0.5);
subFrame.size.width -= (size.width-offset)*(1-scale);
subFrame.size.height = size.height*subFrame.size.width/size.width;
[[self centerImgView] setFrame:subFrame];
[[self centerImgView] setCenter:center];
[[self rightImgView] setCenter:CGPointMake(size.width*2.5, size.height*0.5)];
}
}
}
- (void)handleSubImageViewOriginalFrame{
CGRect subframe = [[self leftImgView] frame];
subframe.origin.x = CGRectGetWidth([self frame])*0;
[[self leftImgView] setFrame:subframe];
subframe.origin.x = CGRectGetWidth([self frame])*1;
[[self centerImgView] setFrame:subframe];
subframe.origin.x = CGRectGetWidth([self frame])*2;
[[self rightImgView] setFrame:subframe];
}
#pragma mark -
-(void)openTimer{
if(self.timer != nil){return;}
NSTimeInterval time = 2.0;
// 获得队列
dispatch_queue_t queue = dispatch_get_main_queue();
// 创建一个定时器(dispatch_source_t本质还是个OC对象)
self.timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, queue);
// 何时开始执行第一个任务
dispatch_time_t start = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(time * NSEC_PER_SEC));
uint64_t interval = (uint64_t)(time * NSEC_PER_SEC);
dispatch_source_set_timer(self.timer, start, interval, 0);
// 设置回调
__weak typeof(self) weakSelf = self;
dispatch_source_set_event_handler(self.timer, ^{
if([weakSelf scrollDirection] == ZJLoopScrollDirectionLeftToRight){
CGPoint offset = [[weakSelf scrollview] contentOffset];
offset.x -= CGRectGetWidth([[weakSelf scrollview] frame]);
[[weakSelf scrollview] setContentOffset:offset animated:true];
}else if([weakSelf scrollDirection] == ZJLoopScrollDirectionRightToLeft){
CGPoint offset = [[weakSelf scrollview] contentOffset];
offset.x += CGRectGetWidth([[weakSelf scrollview] frame]);
[[weakSelf scrollview] setContentOffset:offset animated:true];
}else{
[weakSelf cancelTimer];
}
});
// 启动定时器
dispatch_resume(self.timer);
}
/** 销毁定时器*/
-(void)cancelTimer{
if(self.timer){
dispatch_cancel(self.timer);
self.timer = nil;
}
}
-(void)dealloc{
[self cancelTimer];
}
#pragma mark * * * * * * * * * * * * * * * * * * * * * * * * * * *
- (void)setScrollDirection:(ZJLoopScrollDirection)scrollDirection{
_scrollDirection = scrollDirection;
if([self imageStrs] && scrollDirection != ZJLoopScrollDirectionNone){
[self openTimer];
}
}
- (void)showImagesWithImageStrs:(NSArray<NSString*>*)imageStrs{
[self refreshScrollImagesLayoutWithImageStrs:imageStrs];
[self showDefaultCurrentIndex:[self currentIndex]];
if([self scrollDirection] && [self scrollDirection] != ZJLoopScrollDirectionNone){
[self openTimer];
}else{
[self cancelTimer];
}
}
- (void)showDefaultCurrentIndex:(NSInteger)currentIndex{
[self setCurrentIndex:currentIndex];
[self refrshScrollImageViewForImage];
}
- (void)didSelectSubviewAtIndex:(void(^)(NSInteger index))block{
[self didSelectSubviewAtIndex:block];
}
- (void)didEndDeceleratingAtIndex:(void(^)(NSInteger index))block{
[self didEndDeceleratingAtIndex:block];
}
@end