iOS 自定义方法

示例代码

///////////////////////第一种///////////////////////

//
//  GifView.h
//  GIFViewer
//
//  Created by xToucher04 on 11-11-9.
//  Copyright 2011 Toucher. All rights reserved.
//

#import <UIKit/UIKit.h>
#import <ImageIO/ImageIO.h>

@interface GifView : UIView {
    CGImageSourceRef gif;
    NSDictionary *gifProperties;
    size_t index;
    size_t count;
    NSTimer *timer;
}

- (id)initWithFrame:(CGRect)frame filePath:(NSString *)_filePath;

- (id)initWithFrame:(CGRect)frame data:(NSData *)_data;

@end


//例子
////
////  ViewController.m
////  播放动态图片
////
//
//#import "ViewController.h"
//#import "GifView.h"
//
//@interface ViewController ()
//
//@end
//
//@implementation ViewController
//
//- (void)viewDidLoad {
//    [super viewDidLoad];
//    //第一种 用UIImageView中的动画数组播放动画
//    [self showGifImageMethodOne];
//    //第二种 用UIWebView显示
//    [self showGifImageMethodTwo];
//    //第三种 用第三方GifView显示本地图片
//    [self showGifImageMethodThree];
//    //用第三方显示从网络获取的动态图片
//    [self showGifImageMethodFour];
//}
//
//#pragma mark 播放动态图片方式1 UIImageView
//-(void)showGifImageMethodOne {
//    //第一种 用UIImageView中的动画数组播放动画
//    //创建UIImageView，添加到界面
//    UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(20, 20, 100, 100)];
//    [self.view addSubview:imageView];
//    //创建一个数组，数组中按顺序添加要播放的图片（图片为静态的图片）
//    NSMutableArray *imgArray = [NSMutableArray array];
//    for (int i=1; i<7; i++) {
//        UIImage *image = [UIImage imageNamed:[NSString stringWithFormat:@"clock%02d.png",i]];
//        [imgArray addObject:image];
//    }
//    //把存有UIImage的数组赋给动画图片数组
//    imageView.animationImages = imgArray;
//    //设置执行一次完整动画的时长
//    imageView.animationDuration = 6*0.15;
//    //动画重复次数 （0为重复播放）
//    imageView.animationRepeatCount = 0;
//    //开始播放动画
//    [imageView startAnimating];
//    //停止播放动画  - (void)stopAnimating;
//    //判断是否正在执行动画  - (BOOL)isAnimating;
//}
//
//#pragma mark 播放动态图片方式2 UIWebView
//-(void)showGifImageMethodTwo {
//    //第二种 用UIWebView显示
//    //得到图片的路径
//    NSString *path = [[NSBundle mainBundle] pathForResource:@"happy" ofType:@"gif"];
//    //将图片转为NSData
//    NSData *gifData = [NSData dataWithContentsOfFile:path];
//    //创建一个webView，添加到界面
//    UIWebView *webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 150, 200, 200)];
//    [self.view addSubview:webView];
//    //自动调整尺寸
//    webView.scalesPageToFit = YES;
//    //禁止滚动
//    webView.scrollView.scrollEnabled = NO;
//    //设置透明效果
//    webView.backgroundColor = [UIColor clearColor];
//    webView.opaque = 0;
//    //加载数据
//    [webView loadData:gifData MIMEType:@"image/gif" textEncodingName:nil baseURL:nil];
//}
//
//#pragma mark 播放动态图片方式3 第三方显示本地动态图片
//-(void)showGifImageMethodThree {
//    //方式一
//    //将图片转为NSData数据
//    NSData *localData = [NSData dataWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"bird" ofType:@"gif"]];
//    //创建一个第三方的View显示图片
//    GifView *dataView = [[GifView alloc] initWithFrame:CGRectMake(0, 300, 200, 100) data:localData];
//    [self.view addSubview:dataView];
//    //方式二
//    //得到图片的路径
//    NSString *path = [[NSBundle mainBundle] pathForResource:@"cat" ofType:@"gif"];
//    GifView *dataView2 = [[GifView alloc] initWithFrame:CGRectMake(200, 300, 150, 100) filePath:path];
//    [self.view addSubview:dataView2];
//}
//
//#pragma mark 播放动态图片方式3 第三方显示从网络获取的动态图片
//-(void)showGifImageMethodFour {
//    // 网络图片
//    NSData *urlData = [NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://pic19.nipic.com/20120222/8072717_124734762000_2.gif"]];
//    //创建一个第三方的View显示图片
//    GifView *dataViewWeb = [[GifView alloc] initWithFrame:CGRectMake(20, 420, 280, 100) data:urlData];
//    [self.view addSubview:dataViewWeb];
//}
//
//- (void)didReceiveMemoryWarning {
//    [super didReceiveMemoryWarning];
//}
//
//@end

////////////////////////////////

//
//  GifView.m
//  GIFViewer
//
//  Created by xToucher04 on 11-11-9.
//  Copyright 2011 Toucher. All rights reserved.
//

#import "GifView.h"
#import <QuartzCore/QuartzCore.h>

@implementation GifView

- (id)initWithFrame:(CGRect)frame filePath:(NSString *)_filePath {
    self = [super initWithFrame:frame];
    if (self) {
        gifProperties = [[NSDictionary dictionaryWithObject:[NSDictionary dictionaryWithObject:[NSNumber numberWithInt:0] forKey:(NSString *)kCGImagePropertyGIFLoopCount]
                                                     forKey:(NSString *)kCGImagePropertyGIFDictionary] retain];
        gif = CGImageSourceCreateWithURL((CFURLRef)[NSURL fileURLWithPath:_filePath], (CFDictionaryRef)gifProperties);
        count =CGImageSourceGetCount(gif);
        timer = [NSTimer scheduledTimerWithTimeInterval:0.12 target:self selector:@selector(play) userInfo:nil repeats:YES];
        [timer fire];
    }
    return self;
}

- (id)initWithFrame:(CGRect)frame data:(NSData *)_data{
    self = [super initWithFrame:frame];
    if (self && _data) {
        gifProperties = [[NSDictionary dictionaryWithObject:[NSDictionary dictionaryWithObject:[NSNumber numberWithInt:0] forKey:(NSString *)kCGImagePropertyGIFLoopCount]
                                                     forKey:(NSString *)kCGImagePropertyGIFDictionary] retain];
       gif = CGImageSourceCreateWithData((CFDataRef)_data, (CFDictionaryRef)gifProperties);
        count =CGImageSourceGetCount(gif);
        timer = [NSTimer scheduledTimerWithTimeInterval:0.12 target:self selector:@selector(play) userInfo:nil repeats:YES];
        [timer fire];
    }
    return self;
}

-(void)play {
    index ++;
    index = index % count;
    CGImageRef ref = CGImageSourceCreateImageAtIndex(gif, index, (CFDictionaryRef)gifProperties);
    self.layer.contents = (id)ref;
    CFRelease(ref);
}

-(void)removeFromSuperview {
    NSLog(@"removeFromSuperview");
    [timer invalidate];
    timer = nil;
    [super removeFromSuperview];
}
- (void)dealloc {
    NSLog(@"dealloc");
    CFRelease(gif);
    [gifProperties release];
    [super dealloc];
}
@end

///////////////////////第二种///////////////////////

//
//  UIImageView+Gif.h
//  DemoTest1
//
//  Created by 李鹏超 on 16/8/11.
//  Copyright © 2016年 李鹏超. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface UIImageView (Gif)

-(void)getGifImageWithUrk:(NSURL *)url
               returnData:(void(^)(NSArray<UIImage *> * imageArray,
                                   NSArray<NSNumber *>*timeArray,
                                   CGFloat totalTime,
                                   NSArray<NSNumber *>* widths,
                                   NSArray<NSNumber *>* heights))dataBlock;

-(void)yh_setImage:(NSURL *)imageUrl;

@end

//使用例子
//使用代码示例如下：

//UIImageView * imageView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 50 , 320, 100)];
//NSURL * url = [[NSURL alloc]initFileURLWithPath:[[NSBundle mainBundle] pathForResource:@"1-1.gif" ofType:nil]];
//    [imageView yh_setImage:url];
//    [imageView getGifImageWithUrk:url returnData:^(NSArray<UIImage *> *imageArray, NSArray<NSNumber *> *timeArray, CGFloat totalTime, NSArray<NSNumber *> *widths, NSArray<NSNumber *> *heights) {
//
//    }];

//SDWebImage中的方法例子
//  self.loadingImageView.image = [UIImage sd_animatedGIFWithData:imageData];
//#import <UIKit/UIKit.h>
//
//@interface UIImage (GIF)
//
//+ (UIImage *)sd_animatedGIFNamed:(NSString *)name;
//
//+ (UIImage *)sd_animatedGIFWithData:(NSData *)data;
//
//- (UIImage *)sd_animatedImageByScalingAndCroppingToSize:(CGSize)size;
//
//@end


//getHUb -- 第三方 FLAnimatedImage

////////////////////////////

//
//  UIImageView+Gif.m
//  DemoTest1
//
//  Created by 李鹏超 on 16/8/11.
//  Copyright © 2016年 李鹏超. All rights reserved.
//

#import "UIImageView+Gif.h"
#import <ImageIO/ImageIO.h>

@implementation UIImageView (Gif)

//解析gif文件数据的方法 block中会将解析的数据传递出来
-(void)getGifImageWithUrk:(NSURL *)url
               returnData:(void(^)(NSArray<UIImage *> * imageArray,
                                   NSArray<NSNumber *>*timeArray,
                                   CGFloat totalTime,
                                   NSArray<NSNumber *>* widths,
                                   NSArray<NSNumber *>* heights))dataBlock {
    //通过文件的url来将gif文件读取为图片数据引用
    CGImageSourceRef source = CGImageSourceCreateWithURL((CFURLRef)url, NULL);
    //获取gif文件中图片的个数
    size_t count = CGImageSourceGetCount(source);
    //定义一个变量记录gif播放一轮的时间
    float allTime=0;
    //存放所有图片
    NSMutableArray * imageArray = [[NSMutableArray alloc]init];
    //存放每一帧播放的时间
    NSMutableArray * timeArray = [[NSMutableArray alloc]init];
    //存放每张图片的宽度 （一般在一个gif文件中，所有图片尺寸都会一样）
    NSMutableArray * widthArray = [[NSMutableArray alloc]init];
    //存放每张图片的高度
    NSMutableArray * heightArray = [[NSMutableArray alloc]init];
    //遍历
    for (size_t i=0; i<count; i++) {
        CGImageRef image = CGImageSourceCreateImageAtIndex(source, i, NULL);
        [imageArray addObject:(__bridge UIImage *)(image)];
        CGImageRelease(image);
        //获取图片信息
        NSDictionary * info = (__bridge NSDictionary*)CGImageSourceCopyPropertiesAtIndex(source, i, NULL);
        CGFloat width = [[info objectForKey:(__bridge NSString *)kCGImagePropertyPixelWidth] floatValue];
        CGFloat height = [[info objectForKey:(__bridge NSString *)kCGImagePropertyPixelHeight] floatValue];
        [widthArray addObject:[NSNumber numberWithFloat:width]];
        [heightArray addObject:[NSNumber numberWithFloat:height]];
        NSDictionary * timeDic = [info objectForKey:(__bridge NSString *)kCGImagePropertyGIFDictionary];
        CGFloat time = [[timeDic objectForKey:(__bridge NSString *)kCGImagePropertyGIFDelayTime]floatValue];
        allTime+=time;
        [timeArray addObject:[NSNumber numberWithFloat:time]];
    }
    dataBlock(imageArray,timeArray,allTime,widthArray,heightArray);
}

//为UIImageView添加一个设置gif图内容的方法：

-(void)yh_setImage:(NSURL *)imageUrl{
    __weak id __self = self;
    [self getGifImageWithUrk:imageUrl returnData:^(NSArray<UIImage *> *imageArray, NSArray<NSNumber *> *timeArray, CGFloat totalTime, NSArray<NSNumber *> *widths, NSArray<NSNumber *> *heights) {
        //添加帧动画
        CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"contents"];
        NSMutableArray * times = [[NSMutableArray alloc]init];
        float currentTime = 0;
        //设置每一帧的时间占比
        for (int i=0; i<imageArray.count; i++) {
            [times addObject:[NSNumber numberWithFloat:currentTime/totalTime]];
            currentTime+=[timeArray[i] floatValue];
        }
        [animation setKeyTimes:times];
        [animation setValues:imageArray];
        [animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear]];
        //设置循环
        animation.repeatCount= MAXFLOAT;
        //设置播放总时长
        animation.duration = totalTime;
        //Layer层添加
        [[(UIImageView *)__self layer]addAnimation:animation forKey:@"gifAnimation"];
    }];
}

@end

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原文地址：https://www.cnblogs.com/yujidewu/p/6186990.html