即使contentSize大於frame並且在設置內容大小之前添加了子視圖，scrollView也不起作用

Question

    - (void)viewDidLoad
{

[super viewDidLoad];




self.navigationController.navigationBar.translucent = YES;
[self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"sprites_0001_Rectangle-1.png"]  forBarMetrics:UIBarMetricsDefault];



self.navigationController.navigationBar.translucent = YES;

UIImageView *imageView = [[UIImageView alloc]init];
UIImage *image = [UIImage imageNamed:@"sprites_0000s_0008_1st-Page.png"];
imageView.image = image;


//imageView.translatesAutoresizingMaskIntoConstraints = NO;
imageView.backgroundColor = [UIColor clearColor];
self.view = imageView;



if ([UIDevice currentDevice].userInterfaceIdiom == UIUserInterfaceIdiomPad) {

     //Write the code to set up view for iPad

   }else{

    UIScrollView *scrollView = [[UIScrollView alloc] init];
    scrollView.backgroundColor = [UIColor clearColor];
    scrollView.translatesAutoresizingMaskIntoConstraints = NO;

    [self.view addSubview:scrollView];
    [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-40-[scrollView(==240)]"
                                                                      options:0
                                                                      metrics:nil
                                                                        views:NSDictionaryOfVariableBindings(scrollView)]];
    [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-50-[scrollView(==468)]"
                                                                      options:0
                                                                      metrics:nil
                                                                        views:NSDictionaryOfVariableBindings(scrollView)]];

    UIImageView *imageView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"ParentsMock.png"]];
    imageView.translatesAutoresizingMaskIntoConstraints = NO;
    [scrollView addSubview:imageView];



    [scrollView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"|[imageView(==1000)]|"
                                                                       options:0
                                                                       metrics:0
                                                                         views:NSDictionaryOfVariableBindings(imageView)]];
    [scrollView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[imageView(==2000)]|"
                                                                       options:0
                                                                       metrics:0
                                                                         views:NSDictionaryOfVariableBindings(imageView)]];

    }

這是我嘗試以編程方式創建UIScrollView嘗試，但是即使將子視圖添加到scrollView之后設置contentSize ，也無法使scrollView正常工作。

如您在此圖中看到的，我使用UINavigationController包裝UIViewControllar並將UIImageView設置為其視圖。 我創建了一個scrollView並將其添加到視圖的頂部。 然后創建另一個imageView1並將其插入scrollView中。

請注意，整個視圖控制器的視圖是一個imageView，它與我插入scrollView中的imageView不同。

Answer 1

您應該使用約束條件設置內容大小，直接設置它的大小。 它不會滾動，因為您對滾動視圖內容的左側，頂部，右側或底部沒有約束。 在這里查看我的答案

編輯：

嘗試添加以下內容：

    imageView.translatesAutoresizingMaskIntoConstraints = NO;
    [scrollView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:
                                                         @"|[imageView(==1000)]|"
                                                        options:0
                                                        metrics:0
                                               views:NSDictionaryOfVariableBindings(imageView)]];
    [scrollView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:
                                                         @"V:|[imageView(==2000)]|"
                                                        options:0
                                                        metrics:0
                                               views:NSDictionaryOfVariableBindings(imageView)]];

並刪除您要設置內容大小的代碼。

編輯：

用以下代碼替換整個代碼：

        UIScrollView *scrollView = [[UIScrollView alloc] init];
        scrollView.backgroundColor = [UIColor clearColor];
        scrollView.translatesAutoresizingMaskIntoConstraints = NO;

        [self.view addSubview:scrollView];
        [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-40-[scrollView(==240)]"
                                                                          options:0
                                                                          metrics:nil
                                                                            views:NSDictionaryOfVariableBindings(scrollView)]];
        [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-50-[scrollView(==468)]"
                                                                          options:0
                                                                          metrics:nil
                                                                            views:NSDictionaryOfVariableBindings(scrollView)]];

        UIImageView *imageView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"ParentsMock.png"]];
        imageView.translatesAutoresizingMaskIntoConstraints = NO;
        [scrollView addSubview:imageView];



        [scrollView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"|[imageView(==1000)]|"
                                                                           options:0
                                                                           metrics:0
                                                                             views:NSDictionaryOfVariableBindings(imageView)]];
        [scrollView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[imageView(==2000)]|"
                                                                           options:0
                                                                           metrics:0
                                                                             views:NSDictionaryOfVariableBindings(imageView)]];

Answer 2

我成功創建UIScrollViews的唯一方法是使用自動布局。 這是我知道的最簡單，最有效的方法。 為此，您需要刪除

initWithFrame:CGRectMake(40, 100, 240, 168)];

Answer 3

更換：

NSDictionary *layoutDic = ....

附：

NSDictionary *layoutDic = NSDictionaryOfVariableBindings(scrollView);

編輯：我使用您的代碼，並且它可以工作，我可以滾動，我在viewDidLoad中

UIScrollView *scrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(40, 100, 240, 168)];

UIImageView *imageView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"purple_button.png"]];
[scrollView addSubview:imageView];
scrollView.contentSize = CGSizeMake(1000, 2000);
scrollView.backgroundColor = [UIColor clearColor];
scrollView.scrollEnabled = YES;
scrollView.translatesAutoresizingMaskIntoConstraints = NO;
NSDictionary *layoutDic = NSDictionaryOfVariableBindings(scrollView);
[self.view addSubview:scrollView];
NSArray *scrollViewConstraintWidth = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-40-[scrollView(==240)]" options:0 metrics:nil views:layoutDic];
NSArray *scrollViewConstraintHeight = [NSLayoutConstraint constraintsWithVisualFormat:@"V:|-50-[scrollView(==468)]" options:0 metrics:nil views:layoutDic];
[self.view addConstraints:scrollViewConstraintHeight];
[self.view addConstraints:scrollViewConstraintWidth];

Answer 4

在“顯示文件檢查器”下的屬性中，取消選中“使用自動版式”

Answer 5

像這樣將委托添加到self中：

 UIScrollView *scrollView = [[UIScrollView alloc]init];

scrollView.delegate=self;

 UIImageView *imageView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"ParentsMock.png"]];
 [scrollView addSubview:imageView];

Answer 6

我找到了答案。 看來我需要在UIImageView上啟用userInteraction。 請記住，當我使用UIImageView作為視圖控制器的視圖時。 因此，UIImageView的userInteractionEnabled屬性的默認值為NO。 它完全不接觸。 我們需要像這樣啟用它

imageView.userInteractionEnabled = YES;

問題解決了。