iOS8beta中的UIActionSheet崩溃

我有一些代码,只需点击按钮即可显示UIActionSheet.但是当我在iPad中使用XCode5.1 + iOS8beta构建它时它会崩溃.

下面是我用来显示UIActionSheet的代码.

UIActionSheet *tmpActionSheet = [[UIActionSheet alloc] initWithTitle:nil
                                                                delegate:self
                                                       cancelButtonTitle:@"Cancel"
                                                  destructiveButtonTitle:nil
                                                       otherButtonTitles:
                                     @"Ok",
                                     nil];
    [tmpActionSheet showInView:self.view];

注意:
- 它完全适用于XCode6beta + iOS8beta(iPhone/iPad)
- 完美适用于XCode5.1 + iOS8beta(仅适用于iPhone)

异常的日志记录如下.

2014-06-23 15:54:04.860 ActionSheetDemo[680:191598] Unable to simultaneously satisfy constraints.
    Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) 
(
    "",
    "",
    "=44)]>",
    ""
)

Will attempt to recover by breaking constraint 


Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in  may also be helpful.
2014-06-23 15:54:04.872 ActionSheetDemo[680:191598] Unable to simultaneously satisfy constraints.
    Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) 
(
    "",
    "",
    "=44)]>",
    ""
)

Will attempt to recover by breaking constraint 


Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in  may also be helpful.
2014-06-23 15:54:04.878 ActionSheetDemo[680:191598] Unable to simultaneously satisfy constraints.
    Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) 
(
    "",
    "",
    "=44)]>",
    ""
)

Will attempt to recover by breaking constraint 


Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in  may also be helpful.
2014-06-23 15:54:04.885 ActionSheetDemo[680:191598] Unable to simultaneously satisfy constraints.
    Probably at least one of the constraints in the following list is one you don't want. Try this: (1) look at each constraint and try to figure out which you don't expect; (2) find the code that added the unwanted constraint or constraints and fix it. (Note: If you're seeing NSAutoresizingMaskLayoutConstraints that you don't understand, refer to the documentation for the UIView property translatesAutoresizingMaskIntoConstraints) 
(
    "",
    "",
    "=44)]>",
    ""
)

Will attempt to recover by breaking constraint 


Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in  may also be helpful.
2014-06-23 15:54:04.892 ActionSheetDemo[680:191598] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Application tried to present modally an active controller <_UIAlertShimPresentingViewController: 0x14d450c0>.'
*** First throw call stack:
(0x24702c2f 0x315cdd1f 0x27ffa6e7 0x27df9799 0x2838f3bd 0x2838e94d 0x6bfdd 0x27d4a6c7 0x27d4a669 0x27d34a4d 0x27d4a099 0x27d49d73 0x27d42ff1 0x27d198b1 0x27f8f13d 0x27d183c1 0x246ca597 0x246c99ab 0x246c8029 0x246145a1 0x246143b3 0x2b8cc1b9 0x27d78c41 0x6c239 0x31b67aaf)
libc++abi.dylib: terminating with uncaught exception of type NSException

代码:

#define SYSTEM_VERSION_EQUAL_TO(v)                  ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedSame)
#define SYSTEM_VERSION_GREATER_THAN(v)              ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedDescending)
#define SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v)  ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending)
#define SYSTEM_VERSION_LESS_THAN(v)                 ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedAscending)
#define SYSTEM_VERSION_LESS_THAN_OR_EQUAL_TO(v)     ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedDescending)

@implementation UIActionSheet (simplyShowInViewAddition)

- (void) simplyShowInView:(UIView *) view
{
    if(SYSTEM_VERSION_LESS_THAN(@"8.0"))
    {
        [self showInView:view];
    }
    else
    {
        // "Translating" UIActionSheet to UIAlertController for better compatibility with iOS 8
        UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil message:self.title preferredStyle:UIAlertControllerStyleActionSheet];
        int nactions = [self numberOfButtons];
        int i=0;
        while(i

参考链接