iOS 8 动画执行过程中返回 Crash

Posted 2020-12-05 10-19-92

之前项目里一直有个ios8 [UIScrollView(UIScrollViewInternal) _notifyDidScroll] crash的问题，存在了很久，后来复现问题，返现是动画执行过程中执行pop 的问题

 

场景：在商品详情页加车之后  做了滑动到下面的商品推荐位置， 当动画还没有执行完毕, 就POP回上个页面，就会发生如下Crash

 

参考文档 https://stackoverflow.com/questions/26103756/uiscrollview-internal-consistency-crash

 

 

 

Crashed: com.apple.main-thread

0  libobjc.A.dylib                0x195287bdc objc_msgSend + 28

1  UIKit                          0x18876fbbc -[UIScrollView(UIScrollViewInternal) _notifyDidScroll] + 72

2  UIKit                          0x1884acdb4 -[UIScrollView setContentOffset:] + 500

3  UIKit                          0x188562a98 -[UITableView setContentOffset:] + 300

4  UIKit                          0x188646234 -[UIAnimator(Static) _advanceAnimationsOfType:withTimestamp:] + 316

5  QuartzCore                     0x187e2629c CA::Display::DisplayLinkItem::dispatch() + 32

6  QuartzCore                     0x187e26134 CA::Display::DisplayLink::dispatch_items(unsigned long long, unsigned long long, unsigned long long) + 324

7  IOKit                          0x184c01470 IODispatchCalloutFromCFMessage + 376

8  CoreFoundation                 0x1839f2dc4 __CFMachPortPerform + 180

9  CoreFoundation                 0x183a07a54 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 56

10 CoreFoundation                 0x183a079b4 __CFRunLoopDoSource1 + 436

11 CoreFoundation                 0x183a05934 __CFRunLoopRun + 1640

12 CoreFoundation                 0x1839312d4 CFRunLoopRunSpecific + 396

13 GraphicsServices               0x18d1476fc GSEventRunModal + 168

14 UIKit                          0x1884f6fac UIApplicationMain + 1488

15 ZZKKO                          0x100393c74 main (main.m:16)

16 libdyld.dylib                  0x1958f2a08 start + 4

 

 

原因： iOS8系统下 ViewController被 控制器pop出堆栈以后 ，tableView 已经被release掉，但是 代理方法 仍旧会试图调用 send 消息 到 它的delegate方法。

 

 

解决办法  

- (void)dealloc {

    self.tableView.delegate = nil;

    self.tableView.dataSource = nil;

}