gif

用webview可以比较有效地显示gif, 下面imageData是gif的NSData原始数据 

 

           [webView loadData:imageData MIMEType:@"image/gif" textEncodingName:nil baseURL:nil]; 

             

            webView.scalesPageToFit = YES; 

            // 禁止UIWebView的滚动 

            for (id subview in webView.subviews) { 

                if ([[subview class] isSubclassOfClass:[UIScrollView class]]) { 

                    ((UIScrollView *)subview).scrollEnabled = NO; 

                } 

            } 

 

 

下面是获取图片数据的格式的代码  

 

+ (NSString *)MIMETypeForImageData:(NSData *)data { 

    if (!data) return nil; 

     

    uint8_t c; 

    [data getBytes:&c length:1]; 

     

    switch (c) { 

        case 0xFF: 

            return @"image/jpeg"; 

        case 0x89: 

            return @"image/png"; 

        case 0x47: 

            return @"image/gif"; 

        case 0x49: 

        case 0x4D: 

            return @"image/tiff"; 

    } 

    return nil; 

}