iOS：將照片保存到文件夾時出現內存溢出

Question

我使用儀器檢測我的程序，下面的代碼檢測到內存泄漏 期待您的幫助，謝謝！

int count =（int）array.count;

for (int i=0; i<count; i++) { 
    set=(ALAsset *)[array objectAtIndex:i]; 

    CGImageRef ref1= [set thumbnail]; 

    CGImageRef ref=[[set defaultRepresentation] fullResolutionImage]; 

    NSData * imagedata2=[[NSData alloc]init]; 

    imagedata2=UIImageJPEGRepresentation([[UIImage alloc]initWithCGImage:ref],1); 

    // CGImageRelease(ref); 

    NSString * photoNmaeOgiginal=[NSString stringWithFormat:@"%@_origianl.jpg",uuid]; 

    NSString *PhtotoOriginalPath=[AlbumFolderPath stringByAppendingPathComponent:photoNmaeOgiginal ];   

BOOL  resultOriginal= [NSData writeToFile:PhtotoOriginalPath atomically:YES]; 

} 

Answer 1

有一個與你發佈的代碼一個明顯的問題，該行NSData * imagedata2=[[NSData alloc]init];是完全沒有必要，因爲下一行剛剛替換對象。 可能會觸發內存泄露

所以更換：

NSData * imagedata2=[[NSData alloc]init]; 

imagedata2=UIImageJPEGRepresentation([[UIImage alloc]initWithCGImage:ref],1); 

隨着

NSDate *imagedata2=UIImageJPEGRepresentation([[UIImage alloc]initWithCGImage:ref],1);