UIViews的NSMutableArray

在這個小應用程序中，我只想製作一個調查問卷，在UIView上顯示每個問題。由於調查問卷的大小可能會根據我的需要而改變，因此我想通過使用for循環和NSMutableArray來操作這些UIViews，使代碼非常靈活。我用下面的代碼創建了數組和視圖，但是除了紫色的UIScrollView以外沒有任何東西出現。有人能指出爲什麼綠色的UIViews沒有顯示出來嗎？UIViews的NSMutableArray

ViewController.h

@interface ViewController : UIViewController 

@property (nonatomic, strong) NSMutableArray *viewArray; 
@property UIView *question1View; 
@property UIView *question2View; 
@property UIView *question3View; 

@property UIScrollView *questionScrollView;

ViewController.m

@implementation ViewController 

@synthesize viewArray; 

float viewHeight = 75.0; 
float openViewHeight = 225.0; 
float currentViewPossitionX = 0.0; 
float currentViewPossitionY = 0.0; 
float viewSpacing = 10.0; 
int numberOfQuestions = 3; 

- (void)viewDidLoad { 
    [super viewDidLoad]; 
    [self setUpQuestionnaire]; 

} 


- (void) setUpQuestionnaire{ 

    self.viewArray[numberOfQuestions] = [[NSMutableArray alloc] init]; 
    [viewArray insertObject: _question1View atIndex:0]; 
    [viewArray insertObject: _question2View atIndex:1]; 
    [viewArray insertObject: _question3View atIndex:2]; 

    _question1View.backgroundColor = [UIColor greenColor]; 
    _question2View.backgroundColor = [UIColor greenColor]; 
    _question3View.backgroundColor = [UIColor greenColor]; 

    float viewCount = 0; 

    _questionScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 100, CGRectGetWidth(self.view.bounds), CGRectGetHeight(self.view.bounds))]; 
    _questionScrollView.backgroundColor = [UIColor purpleColor]; 
    _questionScrollView.contentSize = CGSizeMake(CGRectGetWidth(self.view.bounds),(CGRectGetHeight(self.view.bounds)+100)); 
    [self.view addSubview:_questionScrollView]; 

    for(int i = 0; i < numberOfQuestions; i++){ 
     viewArray[i] = [[UIView alloc] initWithFrame:CGRectMake(currentViewPossitionX, currentViewPossitionY, CGRectGetWidth(_questionScrollView.bounds), viewHeight)]; 

     [_questionScrollView addSubview:viewArray[i]]; 
     viewCount++; 
     currentViewPossitionY += viewHeight + viewSpacing; 
    } 

    _questionScrollView.contentSize = CGSizeMake(CGRectGetWidth(self.view.bounds),(viewHeight * viewCount + 500)); 



}

來源

2016-09-28 nfoggia

屬性'backgroundcolor'找不到'id'類型的對象 –

對不起，發佈了一個稍微老一點的版本。我編輯了上面的代碼來匹配。 – nfoggia

你是否啓動了你的viewArray數組？就像我在你的代碼中看到的那樣self.viewArray [numberOfQuestions] = [[NSMutableArray alloc] init];是不是初始化數組代碼 – larva

如果您改變了數組初始化爲以下，

self.viewArray = [[NSMutableArray alloc] init];

初始化你的意見，你將它們添加到您的面前陣列，

_question1View = [[UIView alloc] init]; 
_question2View = [[UIView alloc] init]; 
_question3View = [[UIView alloc] init]; 
[viewArray insertObject: _question1View atIndex:0]; 
[viewArray insertObject: _question2View atIndex:1]; 
[viewArray insertObject: _question3View atIndex:2];

最後只設置在循環的框架，

for(int i = 0; i < numberOfQuestions; i++) { 
    UIView *view = viewArray[i]; 
    view.frame = CGRectMake(currentViewPossitionX, currentViewPossitionY, CGRectGetWidth(_questionScrollView.bounds), viewHeight); 
....

那些它應該工作的變化之後。

來源

2016-09-28 08:22:06 JingJingTao

for(int i = 0; i < numberOfQuestions; i++){ 
    UIView *aview=viewArray[i]; 
    aview = [[UIView alloc] initWithFrame:CGRectMake(currentViewPossitionX, currentViewPossitionY, CGRectGetWidth(_questionScrollView.bounds), viewHeight)]; 
    aview.backgroundColor = [UIColor greenColor]; 
    [_questionScrollView addSubview:aview]; 
    viewCount++; 
    currentViewPossitionY += viewHeight + viewSpacing; 
}

來源

2016-09-28 08:34:34 Harish

我想你應該使用自定義UITableViewCell來實現這一點。優點是 - 輕鬆定製 - 無需管理幀大小爲表視圖有自己的滾動視圖 - 滿足您的所有問題，創建模式陣列，只是重複它的UITableView

如果你想顯示相同類型的UI（數據將根據項目位置進行更改）以列表方式進行查看。

來源

2016-09-28 08:56:53 Pushkraj

UIViews的NSMutableArray

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