在iPhone空闲时间保存图像

Question

我想在服务器空闲时间保存加载的图像。我使用以下命令将图像保存在iPhone内存中。

- (void)saveImage:(UIImage *)image withName:(NSString *)name 
{ 

    NSData *data1 = UIImageJPEGRepresentation(image, 1.0); 
    NSFileManager *fileManager = [NSFileManager defaultManager]; 
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
    NSString *documentsDirectory = [paths objectAtIndex:0]; 
    NSString *fullPath = [documentsDirectory stringByAppendingPathComponent:name]; 
    [fileManager createFileAtPath:fullPath contents:data1 attributes:nil]; 

    if (image==nil) { 
     NSLog(@"Not Saved...:%@",name); 
    } 


} 

但是当他的方法叫我停止了时间....我不想这...我想保存图像时，iPhone是无效.....可以帮助？

谢谢

Answer 1

您需要使用线程在后台执行此操作。

如果你支持的iOS 4.0只，这真的很简单：

- (void)saveImage:(UIImage *)image withName:(NSString *)name { 
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, NULL), ^{ 
     NSData *data1 = UIImageJPEGRepresentation(image, 1.0); 
     NSFileManager *fileManager = [NSFileManager defaultManager]; 
     NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
     NSString *documentsDirectory = [paths objectAtIndex:0]; 
     NSString *fullPath = [documentsDirectory stringByAppendingPathComponent:name]; 
     [fileManager createFileAtPath:fullPath contents:data1 attributes:nil]; 

     if (image==nil) { 
      NSLog(@"Not Saved...:%@",name); 
     } 
    }); 
} 

否则，仰望NSThread文档或performSelectorInBackground:withObject:。