在项目中用到了分页的图片轮播器,这里就分享给需要的小伙伴们把(那个图片的路径只能是网路径,如果要加载本地的,可以先转化为url,再转化为string哦,还有创建的方式用initwithframe的形式哦)
.h文件
//
// ViewController.h
//
// Created by JY on 2017/4/20.
// Copyright © 2017年 JY. All rights reserved.
//
#import <UIKit/UIKit.h>
typedef void (^scrollViewSelectBlock)(NSInteger index);
@interface ImageScrollView : UIView
/** 图片路径数组 **/
@property (strong, nonatomic) NSArray *pics;
/** pageControl 颜色 **/
@property (strong, nonatomic) UIColor *pageColor;
@property (strong, nonatomic) UIColor *pageSelColor;
@property (nonatomic, copy) scrollViewSelectBlock imgViewSelectBlock; // 图片点击事件
- (void)returnIndex:(scrollViewSelectBlock)block; //代码块回调
/** 赋值以后，调用此方法刷新视图 **/
- (void) reloadView;
@end
.m头文件
//
// ViewController.h
//
// Created by JY on 2017/4/20.
// Copyright © 2017年 JY. All rights reserved.
//
#import "ImageScrollView.h"
#import <CommonCrypto/CommonDigest.h>
@interface ImageScrollView()<UIScrollViewDelegate>
@property (retain, nonatomic) UIScrollView * imgScrollView;//图片的滚轮
@property (strong, nonatomic) UIPageControl * pageControl;//图片的页码
@property (retain, nonatomic) NSTimer * time;//定时滚动图片
@property (assign, nonatomic) NSInteger curIndex;//当前位置
@end
@implementation ImageScrollView
-(instancetype)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
UIView *line = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 1, 1)];
line.backgroundColor = [UIColor clearColor];
[self addSubview:line]; //UIScrollView（包括其子类），第一个添加到控制器的视图上才会预留空白，添加这个视图，取消留白
_imgScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, frame.size.width, frame.size.height)];
_imgScrollView.delegate = self;
_imgScrollView.pagingEnabled = YES;
_imgScrollView.bounces = YES;
_imgScrollView.showsHorizontalScrollIndicator = NO;
_imgScrollView.showsVerticalScrollIndicator = NO;
_pageControl = [[UIPageControl alloc] initWithFrame:CGRectMake(frame.size.width * 0.75, frame.size.height - 25, frame.size.width * 0.2, 25)];
_pageControl.pageIndicatorTintColor = [UIColor groupTableViewBackgroundColor];
_pageControl.currentPageIndicatorTintColor = [UIColor whiteColor];
[self addSubview:_imgScrollView];
[self addSubview:_pageControl];
_curIndex = 0;
}
return self;
}
-(void)reloadView {
if (self.pics.count == 0) {
return;
}
CGFloat imgWidth = _imgScrollView.frame.size.width * (self.pics.count + (self.pics.count == 1 ? 0 : 1));
_imgScrollView.contentSize = CGSizeMake(imgWidth, 0);
//添加图片
for (int i = 0; i <= (self.pics.count == 1 ? self.pics.count - 1 : self.pics.count); i++) {
UIImageView *imageView = [UIImageView new];
imageView.contentMode = UIViewContentModeScaleAspectFill;
imageView.clipsToBounds = YES;
NSString *urlStr = @"";
if (i == 0) {
urlStr = self.pics[self.pics.count - 1];
}else {
urlStr = self.pics[i - 1];
}
[self loadImage:urlStr imageView:imageView];
[self setVFrame:i imageView:imageView];
[_imgScrollView addSubview:imageView];
}
//初始化scrollView的滚动位置
_imgScrollView.contentOffset = CGPointMake((self.pics.count == 1 ? 0 : self.imgScrollView.frame.size.width), 0);
//pageController的个数
_pageControl.numberOfPages = self.pics.count;
//添加点击手势
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(clickImgView:)];
[_imgScrollView addGestureRecognizer:tap];
//添加计时器
[self addTimer];
}
- (void)setBttonFrame:(int)index withButton:(UIButton *)sender{
sender.frame = CGRectMake(self.frame.size.width * index, 0, self.frame.size.width, self.frame.size.height);
}
- (void)clickImgView:(UIGestureRecognizer *)sender {
self.imgViewSelectBlock(_curIndex);
}
- (void)returnIndex:(scrollViewSelectBlock)block{
self.imgViewSelectBlock = block;
}
- (void)setVFrame:(int)index imageView:(UIImageView *)image{
image.frame = CGRectMake(self.frame.size.width * index, 0, self.frame.size.width, self.frame.size.height);
}
- (void)nextImage{
if (_curIndex == self.pics.count - 1) {
self.pageControl.currentPage = 0;
_curIndex = 0;
}else {
self.pageControl.currentPage++;
_curIndex++;
}
CGFloat x = (_curIndex + 1) * self.imgScrollView.frame.size.width;
[UIView animateWithDuration:0.5 animations:^{
_imgScrollView.contentOffset = CGPointMake(x, 0);
} completion:^(BOOL finished) {
if (finished && _curIndex == self.pics.count - 1) {
_imgScrollView.contentOffset = CGPointMake(0, 0);
}
}];
}
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{
[self.time invalidate]; //停止计时器
self.time = nil;
}
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{
[self addTimer];
}
- (void)scrollViewDidScroll:(UIScrollView *)scrollView{
if (self.pics.count == 1) {
return;
}
if (scrollView.contentOffset.x > self.pics.count * scrollView.frame.size.width) {
_imgScrollView.contentOffset = CGPointMake(0, 0);
}else if (scrollView.contentOffset.x < 0) {
_imgScrollView.contentOffset = CGPointMake(self.pics.count * scrollView.frame.size.width, 0);
}
}
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
if (self.pics.count == 1) {
return;
}
if (scrollView.contentOffset.x == self.pics.count * scrollView.frame.size.width) {
_imgScrollView.contentOffset = CGPointMake(0, 0);
}
//索引
for (int i = 0; i <= self.pics.count; i++) {
if (scrollView.contentOffset.x == i * self.frame.size.width) {
if (i == 0) {
self.pageControl.currentPage = self.pics.count - 1;
_curIndex = self.pics.count - 1;
}else {
self.pageControl.currentPage = i - 1;
_curIndex = i - 1;
}
}
}
}
- (void)addTimer{
if (self.pics.count != 1) {
self.time = [NSTimer scheduledTimerWithTimeInterval:3.0 target:self selector:@selector(nextImage) userInfo:nil repeats:YES];
}
}
- (void) loadImage:(NSString *)urlStr imageView:(UIImageView *)imgView {
imgView.layer.borderWidth = 0.3;
imgView.layer.borderColor = [UIColor groupTableViewBackgroundColor].CGColor;
NSURL *url = [NSURL URLWithString:urlStr];
if (url == nil) {
return;
}
dispatch_queue_t queue =dispatch_queue_create("loadImage",NULL);
dispatch_async(queue, ^{
if ([self getImageWithName:[self md5:urlStr]] != nil) {
dispatch_sync(dispatch_get_main_queue(), ^{
imgView.image = [self getImageWithName:[self md5:urlStr]];
});
}else {
NSData *resultData = [NSData dataWithContentsOfURL:url];
UIImage *img = [UIImage imageWithData:resultData];
if (img != nil) {
dispatch_sync(dispatch_get_main_queue(), ^{
imgView.image = img;
[self saveImage:img withName:[self md5:urlStr]];
});
}
}
});
}
- (void) saveImage:(UIImage *)currentImage withName:(NSString *)imageName
{
NSData * UIImageJPEGRepresentation (UIImage *image, CGFloat compressionQuality);
NSData *imageData = UIImageJPEGRepresentation(currentImage, 0.5);
// 获取沙盒目录
NSString *fullPath = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:imageName];
// 将图片写入文件
[imageData writeToFile:fullPath atomically:NO];
}
- (UIImage *) getImageWithName:(NSString *)imageName{
NSString *fullPath = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:imageName];
UIImage *savedImage = [[UIImage alloc] initWithContentsOfFile:fullPath];
return savedImage;
}
- (NSString *) md5:(NSString *)str
{
const char *cStr = [str UTF8String];
unsigned char result[CC_MD5_DIGEST_LENGTH];
CC_MD5( cStr, strlen(cStr), result );
return [NSString stringWithFormat:
@"%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X",
result[0], result[1], result[2], result[3],
result[4], result[5], result[6], result[7],
result[8], result[9], result[10], result[11],
result[12], result[13], result[14], result[15]
];
}
@end
