地狱全部
我是iPhone的新手，正在努力解决以下问题。
当我使用以下语句删除滚动视图时，我的应用崩溃。
[scrollView removeFromSuperview];
我添加uiscrollview与以下行。
[self.view addSubview:scrollView];
这是日志。
Thread 0 Crashed:
0 libobjc.A.dylib 0x34a80466 objc_msgSend + 18
1 UIKit 0x341aaaa8 -[UIView(Hierarchy) _makeSubtreePerformSelector:withObject:withObject:copySublayers:] + 152
2 UIKit 0x341aaace -[UIView(Hierarchy) _makeSubtreePerformSelector:withObject:withObject:copySublayers:] + 190
3 UIKit 0x341aaace -[UIView(Hierarchy) _makeSubtreePerformSelector:withObject:withObject:copySublayers:] + 190
4 UIKit 0x341c05a0 -[UIView(Hierarchy) removeFromSuperview] + 208
5 UIKit 0x34249a76 -[UIScrollView removeFromSuperview] + 42
6 KabushikiShimbun 0x000387b6 -[PDFPageScrollViewController ReGenerateScrollViewAsperNewData] (PDFPageScrollViewController.m:1451)
7 KabushikiShimbun 0x00038aac -[PDFPageScrollViewController CheckPageUpdationWithDate:] (PDFPageScrollViewController.m:1441)
8 KabushikiShimbun 0x0003c472 -[PDFPageScrollViewController requestFinished:] (PDFPageScrollViewController.m:792)
9 CoreFoundation 0x35818bb8 -[NSObject(NSObject) performSelector:withObject:] + 16
10 KabushikiShimbun 0x0000e9ba -[ASIHTTPRequest reportFinished] (ASIHTTPRequest.m:1945)
11 CoreFoundation 0x35818bb8 -[NSObject(NSObject) performSelector:withObject:] + 16
12 Foundation 0x3118178e __NSThreadPerformPerform + 262
13 CoreFoundation 0x358307d6 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 6
14 CoreFoundation 0x358025b0 __CFRunLoopDoSources0 + 376
15 CoreFoundation 0x35801e54 __CFRunLoopRun + 224
16 CoreFoundation 0x35801c80 CFRunLoopRunSpecific + 224
17 CoreFoundation 0x35801b88 CFRunLoopRunInMode + 52
18 GraphicsServices 0x320c84a4 GSEventRunModal + 108
19 GraphicsServices 0x320c8550 GSEventRun + 56
20 UIKit 0x341dc322 -[UIApplication _run] + 406
21 UIKit 0x341d9e8c UIApplicationMain + 664
22 KabushikiShimbun 0x00002da6 main (main.m:14)
23 KabushikiShimbun 0x00002d70 start + 32
任何的想法 ？
谢谢。
最佳答案
从超级视图中删除之前，请检查它是否具有超级视图；
if([scrollView superview]!=nil){
[scrollView removeFromSuperview];
}