iOS实现带有缩放效果的自动轮播图
本文实例为大家分享了iOS带有缩放效果的自动轮播图，供大家参考，具体内容如下
可直接设置frame然后加载到视图上使用。
效果就是这样的，图片切换的过程中还是有卡顿，不够流畅，后续更新。
直接上代码。
.h文件包含：
#import <UIKit/UIKit.h>
@interface CustomScrollView : UIView
@property (span,nonatomic) NSArray *imageArr;
@end
.m文件包含:
#import "CustomScrollView.h"
@interface CustomScrollView ()<UIScrollViewDelegate>
@property (span,nonatomic) UIScrollView *scrollView;
@property (span,nonatomic) UIImageView *backImageView;
@property (span,nonatomic) UIImageView *leftIamgeView;
@property (span,nonatomic) UIImageView *middleImageView;
@property (span,nonatomic) UIImageView *rightImageView;
@property (span,nonatomic) UIPageControl *pageControl;
//高度
@property (assign,nonatomic) CGFloat scrollViewHeight;
//手动造成的偏移量
@property (assign,nonatomic) CGFloat offsetX;
@property (span,nonatomic) NSTimer *timer;
//属于计时器方法动画持续时间 ？
@property (assign,nonatomic) BOOL timerAnimation;
@end
//左右内容的最大偏移量
#define OFFSET_MAX ([UIScreen mainScreen].bounds.size.width-64)*0.9
@implementation CustomScrollView
- (instancetype)initWithFrame:(CGRect)frame {
if (self = [super initWithFrame:frame]) {
self.scrollViewHeight = frame.size.height;
[self addSubview:self.backImageView];
[self addSubview:self.scrollView];
[self addSubview:self.pageControl];
[self.backImageView mas_makeConstraints:^(MASConstraintMaker *make) {
make.edges.with.mas_equalTo(self);
}];
[self.scrollView mas_makeConstraints:^(MASConstraintMaker *make) {
make.edges.with.mas_equalTo(self);
}];
[self.pageControl mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.right.bottom.mas_equalTo(self);
make.height.mas_equalTo(@20);
}];
self.timer = [NSTimer scheduledTimerWithTimeInterval:5 target:self selector:@selector(timerAction) userInfo:nil repeats:YES];
[[NSRunLoop mainRunLoop] addTimer:self.timer forMode:NSDefaultRunLoopMode];
[self.timer setFireDate:[NSDate dateWithTimeIntervalSinceNow:5]];
}
return self;
}
- (NSArray *)imageArr {
if (!_imageArr) {
_imageArr = @[@"timg-0",@"timg-1",@"timg-2"];
}
return _imageArr;
}
- (UIImageView *)backImageView {
if (!_backImageView) {
_backImageView = [[UIImageView alloc] init];
_backImageView.image = [UIImage imageNamed:@"bg_home"];
}
return _backImageView;
}
- (UIScrollView *)scrollView {
if (!_scrollView) {
_scrollView = [[UIScrollView alloc] init];
_scrollView.showsVerticalScrollIndicator = NO;
_scrollView.showsHorizontalScrollIndicator = NO;
_scrollView.contentSize = CGSizeMake(kScreenWidth+2*OFFSET_MAX, self.scrollViewHeight);
[_scrollView setContentOffset:CGPointMake(OFFSET_MAX, 0)];
_scrollView.bounces = NO;
_scrollView.delegate = self;
_leftIamgeView = [[UIImageView alloc] init];
_leftIamgeView.image = [UIImage imageNamed:self.imageArr[0]];
_leftIamgeView.layer.cornerRadius = 5;
_leftIamgeView.layer.masksToBounds = YES;
_middleImageView = [[UIImageView alloc] init];
_middleImageView.image = [UIImage imageNamed:self.imageArr[1]];
_middleImageView.layer.cornerRadius = 5;
_middleImageView.layer.masksToBounds = YES;
_rightImageView = [[UIImageView alloc] init];
_rightImageView.image = [UIImage imageNamed:self.imageArr[2]];
_rightImageView.layer.cornerRadius = 5;
_rightImageView.layer.masksToBounds = YES;
[_scrollView addSubview:_leftIamgeView];
[_scrollView addSubview:_middleImageView];
[_scrollView addSubview:_rightImageView];
[_leftIamgeView mas_makeConstraints:^(MASConstraintMaker *make) {
make.size.mas_equalTo(CGSizeMake((kScreenWidth-64)*0.9, self.scrollViewHeight*0.9));
make.centerY.mas_equalTo(_scrollView);
make.right.mas_equalTo(_middleImageView.mas_left).offset(-20);
}];
[_middleImageView mas_makeConstraints:^(MASConstraintMaker *make) {
make.size.mas_equalTo(CGSizeMake(kScreenWidth-64, self.scrollViewHeight));
make.centerY.mas_equalTo(_scrollView);
make.left.mas_equalTo(_scrollView).offset(OFFSET_MAX+64/2);
}];
[_rightImageView mas_makeConstraints:^(MASConstraintMaker *make) {
make.size.mas_equalTo(_leftIamgeView);
make.centerY.mas_equalTo(_scrollView);
make.left.mas_equalTo(_middleImageView.mas_right).offset(20);
}];
}
return _scrollView;
}
- (UIPageControl *)pageControl {
if (!_pageControl) {
_pageControl = [[UIPageControl alloc] init];
_pageControl.numberOfPages = self.imageArr.count;
_pageControl.enabled = NO;
_pageControl.currentPage = 0;
_pageControl.hidesForSinglePage = YES;
_pageControl.pageIndicatorTintColor = [UIColor whiteColor];
_pageControl.currentPageIndicatorTintColor = MAINCOLOR;
}
return _pageControl;
}
#pragma mark ------------ UIScrollViewDelegate --------
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
if (self.timerAnimation) {
return;
}
CGFloat offScale = scrollView.contentOffset.x - OFFSET_MAX;
if (offScale < 0) {
//右滑
self.leftIamgeView.layer.transformScale = 1 + 1.0/9*(fabs(offScale)/OFFSET_MAX);
self.middleImageView.layer.transformScale = 1 - 0.1*(fabs(offScale)/OFFSET_MAX);
} else {
//左滑
self.rightImageView.layer.transformScale = 1 + 1.0/9*(fabs(offScale)/OFFSET_MAX);
self.middleImageView.layer.transformScale = 1 - 0.1*(fabs(offScale)/OFFSET_MAX);
}
}
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate {
CGPoint offset = scrollView.contentOffset;
self.offsetX = offset.x;
if ((fabs(self.offsetX-OFFSET_MAX) >= OFFSET_MAX*0.5)) {
if (!decelerate) {
//替换图片
[self exchangeImage];
}
} else {
//回弹复位
[scrollView setContentOffset:CGPointMake(OFFSET_MAX, 0) animated:YES];
self.leftIamgeView.layer.transform = CATransform3DIdentity;
self.middleImageView.layer.transform = CATransform3DIdentity;
self.rightImageView.layer.transform = CATransform3DIdentity;
}
}
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
//替换图片
[self exchangeImage];
}
#pragma mark ---------- exchangeImage ------
//替换图片
- (void)exchangeImage {
if (self.offsetX-OFFSET_MAX < 0) {
//右滑
UIImage *rightImage = self.rightImageView.image;
self.rightImageView.image = self.middleImageView.image;
self.middleImageView.image = self.leftIamgeView.image;
self.leftIamgeView.image = rightImage;
if (self.pageControl.currentPage - 1 < 0) {
self.pageControl.currentPage = self.pageControl.numberOfPages-1;
} else {
self.pageControl.currentPage -= 1;
}
} else {
//左滑
UIImage *leftImage = self.leftIamgeView.image;
self.leftIamgeView.image = self.middleImageView.image;
self.middleImageView.image = self.rightImageView.image;
self.rightImageView.image = leftImage;
if (self.pageControl.currentPage + 1 >= self.pageControl.numberOfPages) {
self.pageControl.currentPage = 0;
} else {
self.pageControl.currentPage += 1;
}
}
[self.scrollView setContentOffset:CGPointMake(OFFSET_MAX, 0)];
self.leftIamgeView.layer.transform = CATransform3DIdentity;
self.middleImageView.layer.transform = CATransform3DIdentity;
self.rightImageView.layer.transform = CATransform3DIdentity;
}
#pragma mark ---------- timer --------
- (void)timerAction {
self.offsetX = kScreenWidth+OFFSET_MAX-64;
self.timerAnimation = YES;
[UIView animateWithDuration:0.8 animations:^{
[self.scrollView setContentOffset:CGPointMake(self.offsetX, 0)];
self.rightImageView.layer.transformScale = 10/9.0;
self.middleImageView.layer.transformScale = 0.9;
} completion:^(BOOL finished) {
self.timerAnimation = NO;
[self exchangeImage];
self.rightImageView.layer.transform = CATransform3DIdentity;
self.middleImageView.layer.transform = CATransform3DIdentity;
}];
}
@end
最后调用：
self.scrollView = [[CustomScrollView alloc] initWithFrame:CGRectMake(0, 0, kScreenWidth, 170)];
[self.view addSubview:self.scrollView];
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