2018-08-06

//全局Autoreleasepool释放
- (void)viewDidLoad
{
    [super viewDidLoad];
    Person *p1 = [[[Person alloc] init] autorelease];
    NSLog(@"%s",__func__);
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    NSLog(@"%s",__func__);
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
    NSLog(@"%s",__func__);
}

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    Person *p1 = [[[Person alloc] init] autorelease];
}

//结果：
2018-08-06 10:40:03.480734+0800 testDemo[50830:20242191] -[ViewController viewDidLoad]
2018-08-06 10:40:03.480916+0800 testDemo[50830:20242191] -[ViewController viewWillAppear:]
2018-08-06 10:40:03.482709+0800 testDemo[50830:20242191] -[Person dealloc]
2018-08-06 10:40:03.483981+0800 testDemo[50830:20242191] -[ViewController viewDidAppear:]

//局部Autoreleasepool释放
- (void)viewDidLoad
{
    [super viewDidLoad];
    @autoreleasepool {
        Person *p1 = [[[Person alloc] init] autorelease];

//两种方式都可以
//        NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
//        Person *p1 = [[Person alloc] init];
//        [p1 autorelease];
//        [pool drain];


//以下不会释放
//    @autoreleasepool {
//        Person *p1 = [[Person alloc] init];
//    }
    }
    NSLog(@"%s",__func__);
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    NSLog(@"%s",__func__);
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
    NSLog(@"%s",__func__);
}

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    Person *p1 = [[[Person alloc] init] autorelease];
}

//结果：
2018-08-06 10:43:28.531730+0800 testDemo[50863:20265706] -[Person dealloc]
2018-08-06 10:43:28.531854+0800 testDemo[50863:20265706] -[ViewController viewDidLoad]
2018-08-06 10:43:28.531984+0800 testDemo[50863:20265706] -[ViewController viewWillAppear:]
2018-08-06 10:43:28.534778+0800 testDemo[50863:20265706] -[ViewController viewDidAppear:]