iOS加载动态图的两种方法

一

 view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];

    NSString *imagePath =[[NSBundle mainBundle] pathForResource:@"csjg" ofType:@"gif"];

    CGImageSourceRef  cImageSource = CGImageSourceCreateWithURL((__bridge CFURLRef)[NSURL fileURLWithPath:imagePath], NULL);

    size_t imageCount = CGImageSourceGetCount(cImageSource);

    NSMutableArray *images = [[NSMutableArray alloc] initWithCapacity:imageCount];

    NSMutableArray *times = [[NSMutableArray alloc] initWithCapacity:imageCount];

    NSMutableArray *keyTimes = [[NSMutableArray alloc] initWithCapacity:imageCount];

    float totalTime = 0;

    for (size_t i = 0; i < imageCount; i++) {

        CGImageRef cgimage= CGImageSourceCreateImageAtIndex(cImageSource, i, NULL);

        [images addObject:(__bridge id)cgimage];

        CGImageRelease(cgimage);

        NSDictionary *properties = (__bridge NSDictionary *)CGImageSourceCopyPropertiesAtIndex(cImageSource, i, NULL);

        NSDictionary *gifProperties = [properties valueForKey:(__bridge NSString *)kCGImagePropertyGIFDictionary];

        NSString *gifDelayTime = [gifProperties valueForKey:(__bridge NSString* )kCGImagePropertyGIFDelayTime];

        [times addObject:gifDelayTime];

        totalTime += [gifDelayTime floatValue];

//        _size.width = [[properties valueForKey:(NSString*)kCGImagePropertyPixelWidth] floatValue];

//        _size.height = [[properties valueForKey:(NSString*)kCGImagePropertyPixelHeight] floatValue];

    }

    float currentTime = 0;

    for (size_t i = 0; i < times.count; i++) {

        float keyTime = currentTime / totalTime;

        [keyTimes addObject:[NSNumber numberWithFloat:keyTime]];

        currentTime += [[times objectAtIndex:i] floatValue];

    }

    CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"contents"];

    [animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear]];

    [animation setValues:images];

    [animation setKeyTimes:keyTimes];

    animation.duration = totalTime;

    animation.repeatCount = HUGE_VALF;

    [view.layer addAnimation:animation forKey:@"gifAnimation"];

二

//

//  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

//

//  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) {

gifProperties = [[NSDictionary dictionaryWithObject:[NSDictionary dictionaryWithObject:[NSNumber numberWithInt:0] forKey:(NSString *)kCGImagePropertyGIFLoopCount]

forKey:(NSString *)kCGImagePropertyGIFDictionary] retain];

        // gif = CGImageSourceCreateWithURL((CFURLRef)[NSURL fileURLWithPath:_filePath], (CFDictionaryRef)gifProperties);

        gif = CGImageSourceCreateWithData((CFDataRef)_data, (CFDictionaryRef)gifProperties);

count =CGImageSourceGetCount(gif);

timer = [NSTimer scheduledTimerWithTimeInterval:0.5 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