建立繼承于UIView的類WJImageScrollView,代碼實作如下:
WJImageScrollView.h
#import <UIKit/UIKit.h>
/**點選圖檔block,參數目前圖檔索引*/
typedef void(^TapImageViewButtonBlock) (NSInteger imageIndex);
@interface WJImageScrollView : UIView
/**切換圖檔的時間間隔,可選,預設3s*/
@property(nonatomic,assign)CGFloat scrollInterval;
/**頁面銷毀時應該停止定時器,不然無法釋放view 類dealloc時調用
[timer invalidate];
timer = nil;
這個方法能解決問題但不明智,有違封裝思想,實際使用中優化 */
@property(nonatomic,strong)NSTimer * timer;
/**
* 建立輪播器:建立時調用這個方法
*
* @param frame 滾動視圖的frame
* @param images 要顯示的圖檔數組
*
* @return 類的對象
*/
+(instancetype)wjImageScrollViewWithFrame:(CGRect)frame
WithImages:(NSArray *)images;
/**
*
*
* @param frame 滾動視圖的frame
* @param images 要顯示的圖檔數組
*
* @return 類的對象
*/
-(instancetype)initWithFrame:(CGRect)frame
WithIamges:(NSArray *)images;
-(void)addTapEventForImageWithBlock:(TapImageViewButtonBlock)block;
@end WJImageScrollView.m
#import "WJImageScrollView.h"
@interface WJImageScrollView ()<UIScrollViewDelegate>
@property(nonatomic,strong)UIScrollView * mainScrollView;
@property(nonatomic,assign)CGFloat widthView;
@property(nonatomic,assign)CGFloat hightView;
@property(nonatomic,strong)NSArray * imagesNameArray;
@property(nonatomic,assign)NSInteger currentPage;
@property(nonatomic,assign)UIViewContentMode imageViewcontentModel;
@property(nonatomic,strong)UIPageControl * imageViewPageControl;
@property(nonatomic,strong)TapImageViewButtonBlock block;
@end
@implementation WJImageScrollView
+(instancetype)wjImageScrollViewWithFrame:(CGRect)frame
WithImages:(NSArray *)images{
WJImageScrollView * instance = [[WJImageScrollView alloc]
initWithFrame:frame
WithIamges:images];
return instance;
}
-(instancetype)initWithFrame:(CGRect)frame
WithIamges:(NSArray *)images{
self = [super initWithFrame:frame];
self.translatesAutoresizingMaskIntoConstraints = NO;
if (self) {
/**擷取滾動視圖的寬度*/
_widthView = frame.size.width;
/**擷取滾動視圖的高度*/
_hightView = frame.size.height;
_scrollInterval = 3;
/**目前顯示頁面*/
_currentPage = 0;
_imageViewPageControl = UIViewContentModeScaleToFill;
self.clipsToBounds = YES;
_imagesNameArray = images;
/**初始化滾動視圖*/
[self addSubview:self.mainScrollView];
/**建立ImageView*/
[self createImageView];
/**添加imageViewPageControl*/
[self addSubview:self.imageViewPageControl];
/**添加timer*/
[self startTimer];
}
return self;
}
-(void)addTapEventForImageWithBlock:(TapImageViewButtonBlock)block{
if (self.block == nil) {
if (block != nil) {
self.block = block;
[self initImageViewButton];
}
}
}
-(void)initImageViewButton{
for (int i = 0; i <= _imagesNameArray.count; i++) {
UIButton * imageBtn = [[UIButton alloc] initWithFrame:CGRectMake(_widthView * i, 0, _widthView, _hightView)];
imageBtn.tag = 900 + i;
[imageBtn addTarget:self action:@selector(imageBtnClick:) forControlEvents:UIControlEventTouchUpInside];
[self.mainScrollView addSubview:imageBtn];
}
}
#pragma mark - 初始化滾動視圖
-(UIScrollView *)mainScrollView{
if (!_mainScrollView) {
_mainScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, _widthView, _hightView)];
_mainScrollView.contentSize = CGSizeMake(_widthView * _imagesNameArray.count, _hightView);
_mainScrollView.pagingEnabled = YES;
_mainScrollView.showsHorizontalScrollIndicator = NO;
_mainScrollView.showsVerticalScrollIndicator = NO;
_mainScrollView.delegate = self;
_mainScrollView.bounces = NO;
}
return _mainScrollView;
}
#pragma mark - 建立UIImageView
-(void)createImageView{
for (int i = 0; i <= _imagesNameArray.count; i++) {
UIImageView * imageView = [[UIImageView alloc] initWithFrame:CGRectMake(_widthView * i, 0, _widthView, _hightView)];
if (i == _imagesNameArray.count) {
[self addImageToImageViewWithImageView:imageView WithIndex:0];
}else{
[self addImageToImageViewWithImageView:imageView WithIndex:i];
}
[self.mainScrollView addSubview:imageView];
}
}
#pragma mark - 加載網絡圖檔或者本地圖檔
-(void)addImageToImageViewWithImageView:(UIImageView *)imageView WithIndex:(NSInteger)index{
[imageView setImage:[UIImage imageNamed:_imagesNameArray[index]]];
}
-(void)imageBtnClick:(UIButton *)btn{
if (self.block) {
self.block((btn.tag - 900) == self.imagesNameArray.count? 0:(btn.tag - 900));
}
}
#pragma mark - 添加PageControl
-(UIPageControl *)imageViewPageControl{
if (!_imageViewPageControl) {
_imageViewPageControl = [[UIPageControl alloc] initWithFrame:CGRectMake(0,_hightView - 20, _widthView, 20)];
_imageViewPageControl.numberOfPages = _imagesNameArray.count;
_imageViewPageControl.pageIndicatorTintColor = [UIColor whiteColor];
_imageViewPageControl.currentPageIndicatorTintColor = [UIColor redColor];
_imageViewPageControl.currentPage = _currentPage;
}
return _imageViewPageControl;
}
-(void)changeOffset{
if (self.mainScrollView.contentOffset.x / _widthView == _imagesNameArray.count ) {
self.imageViewPageControl.currentPage = 0;
[self.mainScrollView setContentOffset:CGPointMake(0, 0) animated:NO];
}else{
[self.mainScrollView setContentOffset:CGPointMake(self.mainScrollView.contentOffset.x + _widthView, 0) animated:YES];
}
}
#pragma mark - UIScollerView 代理
-(void)scrollViewDidScroll:(UIScrollView *)scrollView{
NSInteger currentPageNum = (self.mainScrollView.contentOffset.x / _widthView) ;
if (self.mainScrollView.contentOffset.x / _widthView == _imagesNameArray.count ) {
self.imageViewPageControl.currentPage = 0;
[self.mainScrollView setContentOffset:CGPointMake(0, 0) animated:NO];
}else{
self.imageViewPageControl.currentPage = currentPageNum;
}
}
- (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView{
[self colseTimer];
}
- (void)scrollViewDidEndDecelerating:(UIScrollView *)_scrollView{
[self startTimer];
}
#pragma mark --- 開始計時
-(void)startTimer{
if (_timer == nil) {
_timer = [NSTimer scheduledTimerWithTimeInterval:_scrollInterval target:self selector:@selector(changeOffset) userInfo:nil repeats:YES];
[[NSRunLoop mainRunLoop]addTimer:_timer forMode:NSRunLoopCommonModes];
}
}
#pragma mark --- 停止計時
-(void)colseTimer
{
if (self.timer) {
[self.timer invalidate];
self.timer = nil;
}
}
-(void)dealloc{
NSLog(@"WJImageScrollView釋放");
}
@end 使用方法
-(void) addWJImageScrollView{
//擷取要顯示的位置
CGRect screenFrame = [[UIScreen mainScreen] bounds];
CGRect frame = CGRectMake(10, 160, screenFrame.size.width - 20, 200);
NSArray *imageArray = @[@"001.jpg", @"002.jpg", @"003.jpg", @"004.jpg", @"005.jpg"];
//初始化控件
self.imageViewDisplay = [WJImageScrollView wjImageScrollViewWithFrame:frame WithImages:imageArray];
//設定輪播時間
self.imageViewDisplay.scrollInterval = 2;
//把該視圖添加到相應的父視圖上
[self.view addSubview:self.imageViewDisplay];
[self.imageViewDisplay addTapEventForImageWithBlock:^(NSInteger imageIndex) {
NSLog(@"點選了------%zd",imageIndex);
}];
} 能解決問題的不好的方法釋放view
-(void)dealloc{
NSLog(@"釋放");
[self.imageViewDisplay.timer invalidate];
self.imageViewDisplay.timer = nil;
} 轉載于:https://www.cnblogs.com/WJJ-Dream/p/5786979.html