iOS 播放GIF动态图片!!!!!
//////////////////////////////////////////////////////////////////////////////////////////
//
// 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.h
// GIFViewer
//
#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
//
// GifView.m
// GIFViewer
//
#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
//两种加载GIF动态图方式的优劣
//经过测试,从加载速度来说,通过UIImageView类别加载的方式更加快速,UIWebView的方式加载时间会稍长,但是从性能上来比较,WebView的方式性能更优,播放的GIF动态图更加流畅,在开发中可以根据需求,适当比较.例如虽然WebView加载的方式性能更好,但是在许多情况下,原生的UIImageView能够更加自由的让开发者扩展.
