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iOS在页面中展示gif动图

关键词:iOSgif  阅读(2520) 赞(17)

[摘要]本文是对iOS在页面中展示gif动图的讲解,对学习IOS苹果软件开发有所帮助,与大家分享。
 - (void)viewDidLoad
 {
     [super viewDidLoad];
     // Do any additional setup after loading the view.
     
     //1:使用第三方库
     NSData *data = [NSData dataWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"moe" ofType:@"gif"]];
     GifView *dataView = [[GifView alloc] initWithFrame:CGRectMake(50, 30, 100, 100) data:data];
     [self.view addSubview:dataView];
     
     // 或者
     GifView *pathView =[[GifView alloc] initWithFrame:CGRectMake(170, 30, 100, 100) filePath:[[NSBundle mainBundle] pathForResource:@"moe" ofType:@"gif"]];
     [self.view addSubview:pathView];
     
     //2:使用webview
     NSString *path = [[NSBundle mainBundle] pathForResource:@"moe" ofType:@"gif"];
     NSData *gifData = [NSData dataWithContentsOfFile:path];
     UIWebView *webView = [[UIWebView alloc] initWithFrame:CGRectMake(110, 150, 100, 100)];
     webView.backgroundColor = [UIColor clearColor];
     webView.scalesPageToFit = YES;
     [webView loadData:gifData MIMEType:@"image/gif" textEncodingName:nil baseURL:nil];
     [self.view addSubview:webView];
 }

第三方库代码

//
//  GifView.h
//  GifDemo
//

#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
//  GifDemo
//

#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];
        gif = CGImageSourceCreateWithURL((__bridge CFURLRef)[NSURL fileURLWithPath:_filePath], (__bridge 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];
        gif = CGImageSourceCreateWithData((__bridge CFDataRef)_data, (__bridge CFDictionaryRef)gifProperties);
        count =CGImageSourceGetCount(gif);
        timer = [NSTimer scheduledTimerWithTimeInterval:0.12 target:self selector:@selector(play) userInfo:nil repeats:YES];
        [timer fire];
    }
    return self;
}

-(void)play
{
    index ++;
    index = index%count;
    CGImageRef ref = CGImageSourceCreateImageAtIndex(gif, index, (__bridge CFDictionaryRef)gifProperties);
    self.layer.contents = (__bridge id)ref;
    CFRelease(ref);
}

-(void)removeFromSuperview
{
    NSLog(@"removeFromSuperview");
    [timer invalidate];
    timer = nil;
    [super removeFromSuperview];
}

- (void)dealloc
{
    NSLog(@"dealloc");
    CFRelease(gif);
}

/*
 // Only override drawRect: if you perform custom drawing.
 // An empty implementation adversely affects performance during animation.
 - (void)drawRect:(CGRect)rect
 {
 // Drawing code
 }
 */

@end


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