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//
// SCGIFImageView.m
// TestGIF
//
// Created by shichangone on 11-7-12.
// Copyright 2011 __MyCompanyName__. All rights reserved.
//
#import "SCGIFImageView.h"
#import <ImageIO/ImageIO.h>
@implementation SCGIFImageFrame
@synthesize image = _image;
@synthesize duration = _duration;
- (void)dealloc
{
[_image release];
[super dealloc];
}
@end
@interface SCGIFImageView ()
- (void)resetTimer;
- (void)showNextImage;
@end
@implementation SCGIFImageView
@synthesize imageFrameArray = _imageFrameArray;
@synthesize timer = _timer;
@synthesize animating = _animating;
- (void)dealloc
{
[self resetTimer];
[_imageFrameArray release];
[_timer release];
[super dealloc];
}
- (void)resetTimer {
if (_timer && _timer.isValid) {
[_timer invalidate];
}
self.timer = nil;
}
- (void)setData:(NSData *)imageData {
if (!imageData) {
return;
}
[self resetTimer];
CGImageSourceRef source = CGImageSourceCreateWithData((CFDataRef)imageData, NULL);
size_t count = CGImageSourceGetCount(source);
NSMutableArray* tmpArray = [NSMutableArray array];
for (size_t i = 0; i < count; i++) {
SCGIFImageFrame* gifImage = [[[SCGIFImageFrame alloc] init] autorelease];
CGImageRef image = CGImageSourceCreateImageAtIndex(source, i, NULL);
gifImage.image = [UIImage imageWithCGImage:image scale:[UIScreen mainScreen].scale orientation:UIImageOrientationUp];
NSDictionary* frameProperties = [(NSDictionary*)CGImageSourceCopyPropertiesAtIndex(source, i, NULL) autorelease];
gifImage.duration = [[[frameProperties objectForKey:(NSString*)kCGImagePropertyGIFDictionary] objectForKey:(NSString*)kCGImagePropertyGIFDelayTime] doubleValue];
gifImage.duration = MAX(gifImage.duration, 0.01);
[tmpArray addObject:gifImage];
CGImageRelease(image);
}
CFRelease(source);
self.imageFrameArray = nil;
if (tmpArray.count > 1) {
self.imageFrameArray = tmpArray;
_currentImageIndex = -1;
_animating = YES;
[self showNextImage];
} else {
self.image = [UIImage imageWithData:imageData];
}
}
- (void)setImage:(UIImage *)image {
[super setImage:image];
[self resetTimer];
self.imageFrameArray = nil;
_animating = NO;
}
- (void)showNextImage {
if (!_animating) {
return;
}
_currentImageIndex = (++_currentImageIndex) % _imageFrameArray.count;
SCGIFImageFrame* gifImage = [_imageFrameArray objectAtIndex:_currentImageIndex];
[super setImage:[gifImage image]];
self.timer = [NSTimer scheduledTimerWithTimeInterval:gifImage.duration target:self selector:@selector(showNextImage) userInfo:nil repeats:NO];
}
- (void)setAnimating:(BOOL)animating {
if (_imageFrameArray.count < 2) {
_animating = animating;
return;
}
if (!_animating && animating) {
//continue
_animating = animating;
if (!_timer) {
[self showNextImage];
}
} else if (_animating && !animating) {
//stop
_animating = animating;
[self resetTimer];
}
}
@end
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