Ios错误:@auto发布池“EXC_BAD_ACCESS”下的线程1 [英] Ios error: Thread 1 under @auto release pool "EXC_BAD_ACCESS
问题描述
应用崩溃,当我点击后退按钮时显示此错误。我有2个视图控制器。在第一个vc的开始按钮工作正常切换到第二个视图,但当我点击后退按钮应用程序崩溃,我得到上面的错误@autorelease池下面的行。我也将发布代码为我的开始&后退按钮。 thx :)
#import
#importAppDelegate.h
The app crashes and shows this error when I hit the Back button. I have 2 view controllers. On the first vc the Start button works fine to switch to second view, but when I hit the Back button the app crashes and I get the error above on the line below @autorelease pool. I will also post the code for my start & back buttons. thx :) #import #import "AppDelegate.h"
int main(int argc, char *argv[])
{
@autoreleasepool {
return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
}
}
第一个vc.H文件开始按钮到第二个视图)
First vc.H file Start Button (this works switching to second view)
@interface ViewController : UIViewController
{
IBOutlet UIButton *StartQuiz;
IBOutlet UIButton *HowToPlay;
IBOutlet UIButton *Credits;
IBOutlet UIButton *Back;
IBOutlet UILabel *Label;
}
-(IBAction)StartQuiz:(id)sender;
-(IBAction)HowToPlay:(id)sender;
-(IBAction)Credits:(id)sender;
-(IBAction)Back:(id)sender;
Firstvc.M
档案
@implementation ViewController
-(IBAction)StartQuiz:(id)sender {
Questions *MenuToQuestions = [[Questions alloc]
initWithNibName:@"Questions"
bundle:nil];
[self.view addSubview:MenuToQuestions.view];
}
SecondVC.h
文件(后退按钮崩溃应用)
SecondVC.h
file (Back button crashes app)
@interface Questions : UIViewController
{
IBOutlet UIButton *BasicOptics;
IBOutlet UIButton *EyeAnatomy;
IBOutlet UIButton *OphthalmicInstruments;
IBOutlet UIButton *Lenses;
IBOutlet UIButton *Transposition;
IBOutlet UIButton *Standards;
IBOutlet UIButton *Frames;
IBOutlet UIButton *Random;
IBOutlet UIButton *Back;
IBOutlet UILabel *Cat1;
IBOutlet UILabel *Cat2;
IBOutlet UIButton *Right1;
IBOutlet UIButton *Right2;
IBOutlet UIButton *Right3;
IBOutlet UIButton *Right4;
IBOutlet UIButton *Wrong1;
IBOutlet UIButton *Wrong2;
IBOutlet UIButton *Wrong3;
IBOutlet UIButton *Wrong4;
IBOutlet UILabel *Answer1;
IBOutlet UILabel *Answer2;
IBOutlet UILabel *Answer3;
IBOutlet UILabel *Answer4;
IBOutlet UILabel *Question;
IBOutlet UILabel *SelectCategory;
IBOutlet UILabel *Lives;
IBOutlet UILabel *Score;
IBOutlet UILabel *LivesWord;
IBOutlet UILabel *ScoreWord;
IBOutlet UILabel *GameOver;
IBOutlet UILabel *FinalScore;
}
-(IBAction)BasicOptics:(id)sender;
-(IBAction)EyeAnatomy:(id)sender;
-(IBAction)OphthalmicInstruments:(id)sender;
-(IBAction)Lenses:(id)sender;
-(IBAction)Transposition:(id)sender;
-(IBAction)Standards:(id)sender;
-(IBAction)Frames:(id)sender;
-(IBAction)Random:(id)sender;
-(IBAction)Right:(id)sender;
-(IBAction)Wrong:(id)sender;
-(IBAction)Back:(id)sender;
@end
Secondvc.m
文件
Secondvc.m
file
-(IBAction)Back:(id)sender {
ViewController *MenuToViewController = [[ViewController alloc]
initWithNibName:@"ViewController"
bundle:nil];
[self.view addSubview:MenuToViewController.view];
}
推荐答案
没有为您的 MenuToViewController
实例在任何地方保留引用。 MenuToViewController
的视图被添加到视图层次结构中,因此它被保留,但是当视图尝试向其中一个插座发送消息时,您的应用崩溃,因为控制器已被释放。
You are not holding a reference for your MenuToViewController
instance anywhere. The view of the MenuToViewController
gets added to the view hierarchy, so it gets retained, but as soon as the view tries to send a message to one of the outlets, your app crashes, because the controller has been released.
一旦你创建了控制器,你可以设置它作为实例变量(添加 Questions * MenuToQuestions
到您的 @interface
)。
Once you create that controller, you could set it as instance variable (add Questions *MenuToQuestions
to your @interface
).
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