iphone - 如何在ios中找到对象在哪里释放

Question

我从父类调用这个方法

图像选择器.m

- (void) imagePickerController:(UIImagePickerController *)thePicker didFinishPickingMediaWithInfo:(NSDictionary *)imageInfo
{

     UIImage *imag = [imageInfo objectForKey:@"UIImagePickerControllerOriginalImage"];
    NSData *imageData = UIImageJPEGRepresentation(imag,0.1);

    [parentviewcontroller requestToParentWithImage:imageData];
}

这里 parentviewcontroller 在 imagepicker.h 中声明

@property(strong,nonatomic)UIViewController<SmartretailDelegate> *parentviewcontroller;

任务列表数据.M

IMAG=[IMAGEPICKER alloc]init];
IMAG.parentviewcontroller=self;

我的问题是 parentviewcontroller 没有分配。它在哪里被释放/崩溃？

Answer 1

'strong' attribute indicates that the parentviewcontroller object is retained and it will be deallocated when imagePicker object gets deallocated. For more information refer this link 'Objective-C ARC: strong vs retain and weak vs assign'.

Answer 2

听起来您需要更多地了解ARC（或自动引用计数）的工作原理。

当你的“ IMAG”对象被 ARC 释放时，对 parentviewcontroller的强引用也会被释放。