iOS載入動態圖的兩種方法

iOS載入動態圖的兩種方法

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

使用的時候：

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