app图片轮播器，无限循环
1、一个.h文件 一个.m文件
2、拿走直接设置一个tableview的头视图，为这个文件的实例对象就ok了！
3、别忘了把我的图片名称改成，你自己的图片名称~
// // HJBHeaderScrollView.h // 05-图片轮播器 // // Created by 小明 on 15/12/15. // Copyright © 2015年 itheima. All rights reserved. // #import <UIKit/UIKit.h> @interface HJBHeaderScrollView : UIScrollView - (instancetype)initWithFrame:(CGRect)frame imgArray:(NSArray *)array; - (void)addTimer; - (void)removeTimer; @end
//
// HJBHeaderScrollView.m
// 05-图片轮播器
//
// Created by 小明 on 15/12/15.
// Copyright © 2015年 itheima. All rights reserved.
//
#import "HJBHeaderScrollView.h"
#import "Masonry.h"
@interface HJBHeaderScrollView ()<UIScrollViewDelegate>
@property(strong, nonatomic) UIPageControl *pageControl;
@property(nonatomic, strong) NSTimer *timer;
@property(nonatomic, strong) NSMutableArray *imgArr;
@property(strong, nonatomic) UIImageView *currentImageView;
@property(strong, nonatomic) UIImageView *leftImageView;
@property(strong, nonatomic) UIImageView *rightImageView;
@end
@implementation HJBHeaderScrollView
- (instancetype)initWithFrame:(CGRect)frame imgArray:(NSArray *)array {
if (self = [super initWithFrame:frame]) {
// 1.添加imageview
CGFloat viewW = self.frame.size.width;
self.imgArr = array.copy;
self.bounces = NO;
self.contentSize = CGSizeMake(3 * viewW, 0);
[self setContentOffset:CGPointMake(self.frame.size.width, 0) animated:NO];
self.showsVerticalScrollIndicator = NO;
self.showsHorizontalScrollIndicator = NO;
// 3.分页
self.pagingEnabled = YES;
[self setupUI];
[self addTimer];
}
return self;
}
//定时器执行的方法
- (void)next {
NSLog(@"====================");
[self setContentOffset:CGPointMake(2 * self.frame.size.width, 0)
animated:YES];
}
/**
* 更新数据换页
*/
- (void)reloadImage {
CGPoint offset = [self contentOffset];
if (offset.x <= 2 * self.frame.size.width &&
offset.x >= 1.5 * self.frame.size.width) {
if (self.pageControl.currentPage == (self.pageControl.numberOfPages - 1)) {
self.pageControl.currentPage = 0;
} else {
self.pageControl.currentPage =
(self.pageControl.currentPage + 1) % (self.pageControl.numberOfPages);
}
} else if (offset.x >= 0 && offset.x <= 0.5 * self.frame.size.width) {
if (self.pageControl.currentPage == 0) {
self.pageControl.currentPage = (self.pageControl.numberOfPages - 1);
} else {
self.pageControl.currentPage =
(self.pageControl.currentPage - 1) % (self.pageControl.numberOfPages);
}
}
self.currentImageView.image = [UIImage
imageNamed:[NSString stringWithFormat:@"img_0%ld",
self.pageControl.currentPage]];
self.rightImageView.image = [UIImage
imageNamed:
[NSString stringWithFormat:@"img_0%ld",
(self.pageControl.currentPage + 1) >=
(self.pageControl.numberOfPages)
? 0
: (self.pageControl.currentPage + 1)]];
self.leftImageView.image = [UIImage
imageNamed:
[NSString stringWithFormat:@"img_0%ld",
(self.pageControl.currentPage - 1) < 0
? (self.pageControl.numberOfPages - 1)
: (self.pageControl.currentPage - 1)]];
}
/**
* 自动滚动结束调用
*
* @param scrollView scrollView
*/
- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView {
[self reloadImage];
[self setContentOffset:CGPointMake(self.frame.size.width, 0) animated:NO];
}
/**
* 手动滚动结束调用
*
* @param scrollView scrollView
*/
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
[self reloadImage];
[self setContentOffset:CGPointMake(self.frame.size.width, 0) animated:NO];
}
//开始拖拽
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
// 移除定时器
[self removeTimer];
}
//结束拖拽是调用
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView
willDecelerate:(BOOL)decelerate {
// 添加定时器
[self addTimer];
}
// 添加定时器
- (void)addTimer {
// 1.添加定时器
NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:2.0
target:self
selector:@selector(next)
userInfo:nil
repeats:YES];
// 2.改变(添加)定时器的模式,能够同时处理两件事情
[[NSRunLoop currentRunLoop] addTimer:timer forMode:NSRunLoopCommonModes];
self.timer = timer;
}
// 移除定时器
- (void)removeTimer {
[self.timer invalidate];
self.timer = nil;
}
/**
* 设置界面控件
*/
- (void)setupUI {
self.delegate = self;
[self addSubview:self.currentImageView];
[self addSubview:self.leftImageView];
[self addSubview:self.rightImageView];
[self addSubview:self.pageControl];
self.pageControl.center = CGPointMake(1.5*self.frame.size.width, 180);
//pageControl自动布局
// [self.pageControl mas_makeConstraints:^(MASConstraintMaker *make) {
//// make.left.equalTo(self.mas_left).with.offset(1.5*self.frame.size.width);
// make.bottom.equalTo(self.mas_bottom).with.offset(180);
// make.centerX.mas_equalTo(self.frame.size.width);
// }];
}
//滚动过程
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
//下面两句话，把pageControl一直放在scrollview中间！
CGPoint offset = [self contentOffset];
self.pageControl.center = CGPointMake(1.5*self.frame.size.width+(offset.x - self.frame.size.width), 180);
}
/**
* 懒加载imgArr
*
* @return imgArr
*/
- (NSMutableArray *)imgArr {
if (_imgArr == nil) {
_imgArr = [NSMutableArray array];
}
return _imgArr;
}
/**
* 懒加载pageControl
*
* @return pageControl
*/
- (UIPageControl *)pageControl {
if (_pageControl == nil) {
_pageControl = [[UIPageControl alloc] initWithFrame:CGRectMake(0, 0, self.frame.size.width, 10)];
_pageControl.pageIndicatorTintColor= [UIColor blueColor];
_pageControl.currentPageIndicatorTintColor = [UIColor redColor];
_pageControl.numberOfPages = self.imgArr.count;
_pageControl.currentPage = 0;
}
return _pageControl;
}
/**
* 懒加载控件
*
* @return currentImageView
*/
- (UIImageView *)currentImageView {
if (_currentImageView == nil) {
_currentImageView =
[[UIImageView alloc] initWithFrame:CGRectMake(self.frame.size.width, 0,
self.frame.size.width,
self.frame.size.height)];
// _currentImageView.image = [UIImage imageNamed:@"img_00"];
_currentImageView.image =
[UIImage imageNamed:[NSString stringWithFormat:@"%@", self.imgArr[0]]];
}
return _currentImageView;
}
/**
* 懒加载控件
*
* @return leftImageView
*/
- (UIImageView *)leftImageView {
if (_leftImageView == nil) {
_leftImageView = [[UIImageView alloc]
initWithFrame:CGRectMake(0, 0, self.frame.size.width,
self.frame.size.height)];
// _leftImageView.image = [UIImage imageNamed:@"img_04"];
_leftImageView.image = [UIImage
imageNamed:[NSString stringWithFormat:@"%@", [self.imgArr lastObject]]];
}
return _leftImageView;
}
/**
* 懒加载控件
*
* @return rightImageView
*/
- (UIImageView *)rightImageView {
if (_rightImageView == nil) {
_rightImageView =
[[UIImageView alloc] initWithFrame:CGRectMake(2 * self.frame.size.width,
0, self.frame.size.width,
self.frame.size.height)];
// _rightImageView.image = [UIImage imageNamed:@"img_01"];
_rightImageView.image =
[UIImage imageNamed:[NSString stringWithFormat:@"%@", self.imgArr[1]]];
}
return _rightImageView;
}
@end