使用 EKEventEditViewController 时崩溃

Question

我有一个奇怪的崩溃，我不知道如何调试...... 代码如下：

-(void) addEventButtonPressed:(UIButton*)button{
DLog(@"Add new event");
// If event is nil, a new event is created and added to the specified event store. New events are 
// added to the default calendar. An exception is raised if set to an event that is not in the 
// specified event store.
// When add button is pushed, create an EKEventEditViewController to display the event.
EKEventEditViewController *addController = [[EKEventEditViewController alloc] initWithNibName:nil bundle:nil];

// set the addController's event store to the current event store.
addController.eventStore = self.eventStore;
addController.editViewDelegate = self;

// present EventsAddViewController as a modal view controller
[self presentModalViewController:addController animated:YES];

}

我的应用程序在这一行经过很长时间后崩溃： [self presentModalViewController:addController Animation:YES];

我正在使用 ARC。 有什么线索吗？ 谢谢！

我的控制台只显示EXC_BAD_ACCESS(code=2, address=0xbf7ffff4)

[编辑] 似乎eventStore 需要在将其传递给addController 之前进行初始化，否则您会崩溃。就我而言，它是零。

Answer 1

确保您从主线程呈现 EKEventEditViewController；如果您从辅助线程呈现它，它将崩溃（并非总是，但通常）。