UIScrollView setContentSize使用未捕获的NSRangeException崩溃

一些UIScrollView的内容被删除后，调用setContentSize会使应用程序崩溃。

int toolbarHeight = [[[self navigationController] toolbar] frame].size.height; int navbarHeight = [[[self navigationController] navigationBar] frame].size.height; int totalHeight = toolbarHeight + navbarHeight; // contentWidth is 640 CGSize contentSize = CGSizeMake(contentWidth, [scrollView frame].size.height - totalHeight); [scrollView setContentSize:contentSize]; // Crash happens here, contentSize is perfectly valid 

*由于未捕获exception'NSRangeException'，原因：'* – [__ NSArrayM objectAtIndex：]：index 1 beyond bounds [0 .. 0]'

什么可能导致这个？

编辑 ：这是可以使任何意义的人的堆栈跟踪：

 * thread #1: tid = 0x1c03, 0x34d2e32c libsystem_kernel.dylib`__pthread_kill + 8, stop reason = signal SIGABRT frame #0: 0x34d2e32c libsystem_kernel.dylib`__pthread_kill + 8 frame #1: 0x36c2a20e libsystem_c.dylib`pthread_kill + 54 frame #2: 0x36c2329e libsystem_c.dylib`abort + 94 frame #3: 0x308eff6a libc++abi.dylib`abort_message + 46 frame #4: 0x308ed34c libc++abi.dylib`_ZL17default_terminatev + 24 frame #5: 0x36361356 libobjc.A.dylib`_objc_terminate + 146 frame #6: 0x308ed3c4 libc++abi.dylib`_ZL19safe_handler_callerPFvvE + 76 frame #7: 0x308ed450 libc++abi.dylib`std::terminate() + 20 frame #8: 0x308ee824 libc++abi.dylib`__cxa_rethrow + 88 frame #9: 0x363612a8 libobjc.A.dylib`objc_exception_rethrow + 12 frame #10: 0x34e9050c CoreFoundation`CFRunLoopRunSpecific + 404 frame #11: 0x34e9036c CoreFoundation`CFRunLoopRunInMode + 104 frame #12: 0x3618c438 GraphicsServices`GSEventRunModal + 136 frame #13: 0x31f86e7c UIKit`UIApplicationMain + 1080 frame #14: 0x0000cb50 App`main + 152 at main.m:16 

Answer 1

当内容偏移超出内容大小时，似乎引发exception。

 I had views side by side in the scroll view and the offset was to the last view. +------+------+------+ | | |offset| +------+------+------+ Now the last view is removed and the content size changed to a smaller one. +------+------+ | | |offset +------+------+ The offset is left behind. 

我更改了代码，以便首先移动偏移量，然后更改内容大小。

 +------+------+ | |offset| +------+------+ 

到目前为止没有崩溃。