iOS中的模式鎖定

Question

我需要爲我的應用程序進行模式鎖定。我遵循的示例是從這裏：http://blog.grio.com/2011/11/android-pattern-lock-on-iphone.html

但它是一個全屏鎖。我需要模式鎖只出現在屏幕的一部分，因爲我的屏幕也需要有文本字段和按鈕。我已經改變了一些座標，並將圖案縮小到其尺寸的四分之一。

示例中給出的代碼使用presentModalViewController:animated:，這意味着該視圖應該全屏顯示。應該怎麼做才能使視圖不會全屏顯示？此外，當我在代碼移植到故事板一個新的項目，我得到異常NSInvalidArgument:無法識別的選擇發送到實例

DrawPattern：

- (id)initWithFrame:(CGRect)frame 
{ 
    self = [super initWithFrame:frame]; 
    if (self) { 
     // Initialization code 
    } 

    return self; 
} 

// Only override drawRect: if you perform custom drawing. 
// An empty implementation adversely affects performance during animation. 
- (void)drawRect:(CGRect)rect 
{ 
    NSLog(@"drawrect..."); 

    if (!_trackPointValue) 
     return; 

    CGContextRef context = UIGraphicsGetCurrentContext(); 
    CGContextSetLineWidth(context, 10.0); 
    CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceRGB(); 
    CGFloat components[] = {0.5, 0.5, 0.5, 0.8}; 
    CGColorRef color = CGColorCreate(colorspace, components); 
    CGContextSetStrokeColorWithColor(context, color); 

    CGPoint from; 
    UIView *lastDot; 
    for (UIView *dotView in _dotViews) { 
     from = dotView.center; 
     NSLog(@"drwaing dotview: %@", dotView); 
     NSLog(@"\tdrawing from: %f, %f", from.x, from.y); 

     if (!lastDot) 
      CGContextMoveToPoint(context, from.x, from.y); 
     else 
      CGContextAddLineToPoint(context, from.x, from.y); 

     lastDot = dotView; 
    } 

    CGPoint pt = [_trackPointValue CGPointValue]; 
    NSLog(@"\t to: pt = %f, pt = %f", pt.x, pt.y); 
    CGContextAddLineToPoint(context, pt.x, pt.y); 

    CGContextStrokePath(context); 
    CGColorSpaceRelease(colorspace); 
    CGColorRelease(color); 

    _trackPointValue = nil; 
} 


- (void)clearDotViews { 
    [_dotViews removeAllObjects]; 
} 


- (void)addDotView:(UIView *)view { 
    if (!_dotViews) 
     _dotViews = [NSMutableArray array]; 

    [_dotViews addObject:view]; 
} 


- (void)drawLineFromLastDotTo:(CGPoint)pt { 
    _trackPointValue = [NSValue valueWithCGPoint:pt]; 
    [self setNeedsDisplay]; 
} 

的ViewController：

- (void)viewDidLoad 
{ 


    // Do any additional setup after loading the view, typically from a nib. 
} 
- (void)viewWillAppear:(BOOL)animated 
{ 
    [super viewWillAppear:animated]; 
} 

- (void)viewDidAppear:(BOOL)animated 
{ 
    [super viewDidAppear:animated]; 
} 

- (void)viewWillDisappear:(BOOL)animated 
{ 
    [super viewWillDisappear:animated]; 
} 

- (void)viewDidDisappear:(BOOL)animated 
{ 
    [super viewDidDisappear:animated]; 
} 

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation 
{ 
    // Return YES for supported orientations 
    return NO; 
} 


- (void)lockEntered:(NSString*)key { 
    NSLog(@"key: %@", key); 

    if (![key isEqualToString:@"020508"]) { 
     UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Error" 
                  message:@"Wrong pattern!" 
                  delegate:nil 
                cancelButtonTitle:nil 
                otherButtonTitles:@"OK", nil]; 
     [alertView show]; 
    } 
    else 
     [self dismissModalViewControllerAnimated:YES]; 
} 


- (IBAction)lockClicked:(id)sender { 
    DrawPatternViewController *lockVC = [[DrawPatternViewController alloc] init]; 
    [lockVC setTarget:self withAction:@selector(lockEntered:)]; 
    [self presentModalViewController:lockVC animated:YES]; 
} 

請幫幫忙！ ！

Answer 1

您需要將您的'鎖定視圖'添加爲其他文本字段的視圖的子視圖，並將控制代碼遷移到控制該視圖的視圖控制器。那麼你將不會有需要推送的視圖控制器。

從技術上講，你可以改爲將'lock vies的視圖控制器作爲子視圖控制器添加（以便將來重用）。在這種情況下，'鎖定視圖'仍作爲視圖的子視圖與其他文本字段一起添加。