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
#import
@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
@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
使用的时候：
GifView *pathView =[[GifView alloc] initWithFrame:CGRectMake(100, 0, 100, 100) filePath:[[NSBundle mainBundle] pathForResource:@"csjg" ofType:@"gif"]];