使用开关按钮

Question

开关按钮默认处于OFF状态。当用户选择ON状态时，将显示模态视图。这是我必须调用这个过程，但它不起作用。我有这个成立于笔尖，但我也能做到这一点编程只想混账东西的工作...

MyViewController.h：

- (IBAction)offSwitchChange:(id)sender; 

@end 

MyViewController.m：

- (IBAction)offSwitchChange:(id)sender 
{ 
    if (self.myKeyPadViewController == nil) 
     self.myKeyPadViewController = [[[KeyPadViewController alloc] initWithNibName: 
             NSStringFromClass([KeyPadViewController class]) bundle:nil] autorelease]; 

    [self.navigationController presentModalViewController:self.myKeyPadViewController animated:YES]; 
} 

@end 

Answer 1

你可能想以此来检测改变事件：

// Do this in viewDidLoad 
[switch addTarget:self action:@selector(switched) forControlEvents:UIControlEventValueChanged]; 

// Then implement it like this 
- (void)switched; 
{ 
    if ([switch isOn]) 
    { 
     if (self.myKeyPadViewController == nil) 
      self.myKeyPadViewController = [[[KeyPadViewController alloc] init] autorelease]; 

     [self.navigationController presentModalViewController:self.myKeyPadViewController animated:YES]; 
    } 
} 

创建一个IBOutlet UISw痒在你的视图控制器中调用开关并在IB中挂钩。

UPDATE：

下面是我测试了一些实际代码：

#import "SwitchResponderViewController.h" 

@implementation SwitchResponderViewController 


- (void)viewDidLoad { 
    [super viewDidLoad]; 
    [sw addTarget:self action:@selector(switched) forControlEvents:UIControlEventValueChanged]; 
} 

- (void)dealloc { 
    [secondController release], secondController = nil; 
    [super dealloc]; 
} 

- (void)switched; 
{ 
    if ([sw isOn]) 
    { 
     NSLog(@"On"); 
     if (!secondController) 
      secondController = [[SecondViewController alloc] init]; 

     [self presentModalViewController:secondController animated:YES]; 
    } 
    else 
    { 
     NSLog(@"Off"); 
    } 

} 

@end 

希望有所帮助。