顯示自定義的視圖問題

Question

當我點擊按鈕，我只得到1額外的觀點，但我想成爲點擊數動態添加一個視圖，（如for循環）...請幫助我這個代碼，由於提前， 這只是我的代碼部分

if (boolVal == true) { 
    CGRect newFrameC = CGRectMake(_centreView.frame.origin.x, _centreView.frame.origin.y, _centreView.frame.size.width, 50); 
    CGRect newFrameL1 = CGRectMake(_label2.frame.origin.x, _label2.frame.origin.y+50, _label2.frame.size.width, 50); 
    _centreView.frame = newFrameC; 
    _label2.frame = newFrameL1; 
    boolVal = false; 
}else if (boolVal == false){ 
    CGRect newFrameC = CGRectMake(_centreView.frame.origin.x, _centreView.frame.origin.y, _centreView.frame.size.width, 1); 
    CGRect newFrameL1 = CGRectMake(_label2.frame.origin.x, _label2.frame.origin.y-50, _label2.frame.size.width, 50); 
    _centreView.frame = newFrameC; 
    _label2.frame = newFrameL1; 
    boolVal = true; 
} 

Answer 1

DummyViewController.m

#import "DummyViewController.h" 
#import "ExtraView.h" 

@interface DummyViewController() 

@property (nonatomic) unsigned int numberOfExtraViews; 
@property (nonatomic, strong) NSMutableArray<ExtraView*>* extraViews; 
@property (nonatomic, strong) UILabel* label1; 
@property (nonatomic, strong) UILabel* label2; 

@end 

@implementation DummyViewController 

-(void) removeExtraViews{ 
    for (ExtraView* extraView in _extraViews){ 
     [extraView removeFromSuperview]; 
    } 
    [_extraViews removeAllObjects]; 
} 

-(CGRect) getExtraViewFrame{ 
    CGRect extraViewFrame = _label1.frame; 
    if (_numberOfExtraViews > 0) { 
     extraViewFrame = [_extraViews lastObject].frame; 
    } 
    extraViewFrame.origin.x += extraViewFrame.size.height; 
    return extraViewFrame; 
} 

- (void) addExtraViews{ 
    //[self removeExtraViews]; 
    int numberOfExtraViewsToDraw = _numberOfExtraViews - _extraViews.count; 

    for (int iterator = 0; iterator < numberOfExtraViewsToDraw; iterator ++){ 
     CGRect extraViewFrame = [self getExtraViewFrame]; 
     ExtraView *extraView = [[ExtraView alloc]initWithFrame:extraViewFrame]; 
     [self.view addSubview:extraView]; 
     [_extraViews addObject:extraView]; 
    } 

    if (numberOfExtraViewsToDraw > 0) { 
     CGRect label2Frame = [_extraViews lastObject].frame; 
     label2Frame.origin.x += label2Frame.size.height; 
     _label2.frame = label2Frame; 
    } 

} 

- (void)viewDidLoad { 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view. 
    [self addExtraViews]; 
    //rest of your code 
} 

//Use this code in initWithNib/initWithCoder. Don't copy paste the same 
-(instancetype)init{ 
    self = [super init]; 
    if (nil != self){ 
     _numberOfExtraViews = 0; 
     _extraViews = [[NSMutableArray alloc]init]; 
    } 
    return self; 
} 

//the function that gets hit when the button is tapped. 
- (void) onButtonTap{ 
    _numberOfExtraViews++; 
    [self.view setNeedsDisplay]; 
} 

注意以下幾點：

1. 我不明白boolVal是什麼，但如果它保持在按鈕的點擊切換，你永遠不會有多個views.I假定它切換，所以我沒有使用它。
2. 使用initWithNib/initWithCoder中的init代碼。不要複製粘貼相同。不要覆蓋給定的代碼。只需附加到當前的init。
3. 在我的代碼onButtonTap是當按鈕被點擊時被擊中的函數。

4. 我已經通過確保viewDidLoad方法獲得了命中。但我不認爲這是必要的。你也可以這樣做：

   //the function that gets hit when the button is tapped. 
   - (void) onButtonTap{ 
       _numberOfExtraViews++; 
       [self addExtraViews]; 
   } 
   

什麼已經做了：

1. 讓我叫你爲CENTERVIEW所謂的extraView。會有很多extraViews，所以我會爲相同的（extraViews）創建一個數組。
2. 視圖數的計數存儲在numberOfExtraViews中。在init中啓動爲0。
3. 無論何時按下按鈕，我們都會增加計數和呼叫視圖的setNeedsDisplay，然後依次觸碰viewDidLoad方法
4. 在viewDidLoad中，我們添加extraViews。