iOS 播放Gif动画
//
// loadGifView.h
// PlayGif
//
// Created by 寒竹子 on 15/4/27.
// Copyright (c) 2015年 寒竹子. All rights reserved.
//
#import <UIKit/UIKit.h>
@interface loadGifView : UIView
/**
* @brief 初始化
*
* @return
*/
- (instancetype)initWithFrame:(CGRect)frame localFileURL:(NSURL *)fileURL;
/**
* @brief 开始gif动画
*
* @return
*/
- (void)startGifAnimation;
/**
* @brief 停止gif动画
*
* @return
*/
- (void)stopGifAnimation;
/**
* @brief 得到gif中所有的图片的frame
*
* @return
*/
+ (NSArray *)getFramesFromGif:(NSURL *)fileURL;
@end
//
// loadGifView.m
// PlayGif
//
// Created by 寒竹子 on 15/4/27.
// Copyright (c) 2015年 寒竹子. All rights reserved.
// 播放gif
#import "loadGifView.h"
#import <ImageIO/ImageIO.h>
#import <QuartzCore/CoreAnimation.h>
@interface loadGifView ()
@property (nonatomic, strong) NSMutableArray * frames;
@property (nonatomic, strong) NSMutableArray * frameDelayTimes;
@property (nonatomic, assign) CGFloat totalTime;
@property (nonatomic, assign) CGFloat width;
@property (nonatomic, assign) CGFloat height;
@end
@implementation loadGifView
/**
* @brief 得到gif图片的信息
*
* @param
* @return
*/
void getFrameInfo(CFURLRef url, NSMutableArray *frames, NSMutableArray *delayTimes, CGFloat *totalTime,CGFloat *gifWidth, CGFloat *gifHeight)
{
CGImageSourceRef gifSource = CGImageSourceCreateWithURL(url, NULL);
// get frame count
size_t frameCount = CGImageSourceGetCount(gifSource);
for (size_t i = 0; i < frameCount; ++i) {
// get each frame
CGImageRef frame = CGImageSourceCreateImageAtIndex(gifSource, i, NULL);
[frames addObject:(__bridge id)frame];
CGImageRelease(frame);
// get gif info with each frame
NSDictionary *dict = (NSDictionary*)CFBridgingRelease(CGImageSourceCopyPropertiesAtIndex(gifSource, i, NULL));
NSLog(@"kCGImagePropertyGIFDictionary %@", [dict valueForKey:(NSString*)kCGImagePropertyGIFDictionary]);
// get gif size
if (gifWidth != NULL && gifHeight != NULL) {
*gifWidth = [[dict valueForKey:(NSString*)kCGImagePropertyPixelWidth] floatValue];
*gifHeight = [[dict valueForKey:(NSString*)kCGImagePropertyPixelHeight] floatValue];
}
// kCGImagePropertyGIFDictionary中kCGImagePropertyGIFDelayTime,kCGImagePropertyGIFUnclampedDelayTime值是一样的
NSDictionary *gifDict = [dict valueForKey:(NSString*)kCGImagePropertyGIFDictionary];
[delayTimes addObject:[gifDict valueForKey:(NSString*)kCGImagePropertyGIFDelayTime]];
if (totalTime) {
*totalTime = *totalTime + [[gifDict valueForKey:(NSString*)kCGImagePropertyGIFDelayTime] floatValue];
}
CFRelease(CFBridgingRetain(dict));
}
if (gifSource) {
CFRelease(gifSource);
}
}
- (instancetype)initWithFrame:(CGRect)frame localFileURL:(NSURL *)fileURL
{
self = [super initWithFrame:frame];
if (self) {
_frames = [[NSMutableArray alloc] init];
_frameDelayTimes = [[NSMutableArray alloc] init];
_width = 0;
_height = 0;
if (fileURL) {
getFrameInfo((__bridge CFURLRef)fileURL, _frames, _frameDelayTimes, &_totalTime, &_width, &_height);
}
}
return self;
}
+ (NSArray *)getFramesFromGif:(NSURL *)fileURL
{
NSMutableArray *frames = [NSMutableArray arrayWithCapacity:3];
NSMutableArray *delays = [NSMutableArray arrayWithCapacity:3];
getFrameInfo((__bridge CFURLRef)fileURL, frames, delays, NULL, NULL, NULL);
return frames;
}
- (void)startGifAnimation
{
CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"contents"];
NSMutableArray *times = [NSMutableArray arrayWithCapacity:3];
CGFloat currentTime = 0;
int count = (int)_frameDelayTimes.count;
for (int i = 0; i < count; ++i) {
[times addObject:[NSNumber numberWithFloat:(currentTime / _totalTime)]];
currentTime += [[_frameDelayTimes objectAtIndex:i] floatValue];
}
[animation setKeyTimes:times];
NSMutableArray *images = [NSMutableArray arrayWithCapacity:3];
for (int i = 0; i < count; ++i) {
[images addObject:[_frames objectAtIndex:i]];
}
[animation setValues:images];
[animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear]];
animation.duration = _totalTime;
animation.delegate = self;
animation.repeatCount = MAXFLOAT;
[self.layer addAnimation:animation forKey:@"gifAnimation"];
}
- (void)stopGifAnimation
{
[self.layer removeAllAnimations];
}
@end
//
// PlayGifViewController.h
// PlayGif
//
// Created by 寒竹子 on 15/4/27.
// Copyright (c) 2015年 寒竹子. All rights reserved.
//
#import <UIKit/UIKit.h>
@interface PlayGifViewController : UIViewController
@end
//
// PlayGifViewController.m
// PlayGif
//
// Created by 寒竹子 on 15/4/27.
// Copyright (c) 2015年 寒竹子. All rights reserved.
//
#import "PlayGifViewController.h"
#import "loadGifView.h"
@interface PlayGifViewController ()
@property (nonatomic, strong) NSArray * imageArr;
@end
@implementation PlayGifViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor blackColor];
// 播放gif动画
NSString * path = [[NSBundle mainBundle] pathForResource:@"2.gif" ofType:nil];
loadGifView * gifView = [[loadGifView alloc] initWithFrame:CGRectMake(([UIScreen mainScreen].bounds.size.width - 200) / 2.0f, 100, 200, 300) localFileURL:[NSURL fileURLWithPath:path]];
[gifView startGifAnimation];
[self.view addSubview:gifView];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
@end
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