问题描述

点击自定义的按钮应用就会中止

创建了导航条的自定义按钮，点击时，会中止：

-(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：

2013-07-28 15:00:37.932 Habit Pal[1562:c07] -[SleepModeViewController back]: unrecognized selector sent to instance 0x91673002013-07-28 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) 

解决方案

你的按钮是在SleepModeViewController试图使用选择器back，而实际上你给方法命名为-goBackOne。你应该重命名-goBackOne方法为-back，或者将选择器的名字改为goBackOne。举例：

// The selector must actually match a method name on the target[backButton addTarget:self action:@selector(goBackOne) forControlEvents:UIControlEventTouchUpInside];

选择器和方法命名匹配非常重要。错误是提示你没有名为-back的选择器。