UIView（xib）框架之外的UIButton

我有一個自定義的UIView XIB，它被加載到我的ViewController上，並且在添加到子視圖之前將框架調整爲摺疊狀態。綁定到我的XIB的UIButton顯示框架小於按鈕位置。當框架展開/摺疊時，如何隱藏和顯示我的UIButton？我的XIB沒有使用AutoLayout。UIView（xib）框架之外的UIButton

ViewController.m

self.greenView = [[[NSBundle mainBundle] loadNibNamed:@"Green" owner:self options:nil] objectAtIndex:0]; 
[self.navigationController.view addSubview:self.greenView];

GreenView.h

@interface GreenView : UIView 
@property (weak, nonatomic) IBOutlet UIView *expandView; 
@property (nonatomic, getter = isExpanded) BOOL expand; 
@property (weak, nonatomic) IBOutlet UIButton *testButton; 
- (IBAction)testButtonTapped:(id)sender; 
@end

GreenView.m

@interface GreenView() 
@property (nonatomic) UITapGestureRecognizer *tapGesture; 
@end 

@implementation GreenView 
- (void)awakeFromNib { 
    CGRect frame = self.frame; 
    frame.size.height = self.expandView.frame.size.height; 
    frame.origin.y = 200; 
    self.frame = frame; 
    self.expand = NO; 
    [self.expandView addGestureRecognizer:self.tapGesture]; 
} 

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

- (UITapGestureRecognizer *)tapGesture { 
    if (!_tapGesture) { 
     _tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapClicked:)]; 
    } 
    return _tapGesture; 
} 

- (void)tapClicked:(UIGestureRecognizer *)recognizer { 
    CGRect frame = self.frame; 
    self.expand = !self.expand; 
    frame.size.height = self.expand ? gvExpandedHeight : gvCollapsedHeight; 

    [UIView animateWithDuration:0.5 animations:^{ 
     self.frame = frame; 
    } completion:^(BOOL finished) { 
     NSLog(@"Frame after animation: %@", NSStringFromCGRect(self.frame)); 
    }]; 
} 

- (IBAction)testButtonTapped:(id)sender { 
    NSLog(@"Test button tapped"); 
} 
@end

已摺疊：

Collapsed