Iphone 点击导航栏上的自定义按钮时,应用程序终止
我为导航栏制作了一个自定义按钮,但当我点击它时,它就会终止Iphone 点击导航栏上的自定义按钮时,应用程序终止,iphone,uibutton,termination,Iphone,Uibutton,Termination,我为导航栏制作了一个自定义按钮,但当我点击它时,它就会终止 -(void)viewDidLoad { UIImage *backButtonImage = [UIImage imageNamed:@"button.png"]; UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom]; [backButton setImage:backButtonImage forState:UIControlStateN
-(void)viewDidLoad
{
UIImage *backButtonImage = [UIImage imageNamed:@"button.png"];
UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];
[backButton setImage:backButtonImage forState:UIControlStateNormal];
backButton.frame = CGRectMake(0, 0, backButtonImage.size.width, backButtonImage.size.height);
[backButton addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *customBackBarItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];
self.navigationItem.leftBarButtonItem = customBackBarItem;
}
-(void)goBackOne
{
[self.navigationController popToRootViewControllerAnimated:YES];
}
输出是
2013-07-28 15:00:37.932 Habit Pal[1562:c07] -[SleepModeViewController back]: unrecognized selector sent to instance 0x9167300
2013-07-28 15:00:37.932 Habit Pal[1562:c07] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[SleepModeViewController back]: unrecognized selector sent to instance 0x9167300'
*** First throw call stack:
(0x1c93012 0x10d0e7e 0x1d1e4bd 0x1c82bbc 0x1c8294e 0x10e4705 0x182c0 0x18258 0xd9021 0xd957f 0xd86e8 0x47cef 0x47f02 0x25d4a 0x17698 0x1beedf9 0x1beead0 0x1c08bf5 0x1c08962 0x1c39bb6 0x1c38f44 0x1c38e1b 0x1bed7e3 0x1bed668 0x14ffc 0x213d 0x2065)
libc++abi.dylib: terminate called throwing an exception
(lldb)
您的按钮正在尝试使用
SleepModeViewController
上的选择器back
,但实际上您已将该方法命名为-goBackOne
。您可以将-goBackOne
方法重命名为-back
,或者将选择器的名称更改为goBackOne
。例如:
// The selector must actually match a method name on the target
[backButton addTarget:self action:@selector(goBackOne) forControlEvents:UIControlEventTouchUpInside];
选择器名称和方法名称必须匹配,这一点很重要。错误表明您的问题是名为
-back
的选择器不存在。当您的应用程序因这些错误而终止时,您应该检查所有的@selector()
语句是否与实际的方法名称匹配。这不是您的问题/问题的一部分,但您应该尝试并养成在执行任何其他操作之前调用-super
方法(如-viewDidLoad
)的习惯。