嵌入容器視圖到UIScrollView的

Question

我一直在尋找高和低，試圖弄清楚這一點，希望有人能幫助（我想這大概是相當微不足道，但我只是在混亂的情況！）

我使用XCode 5和故事板。我有一個容器視圖，佔據了iPhone屏幕空間的75％左右。在這之上我有一些按鈕（和其他小工具）。我希望能夠在按下其中一個按鈕時將視圖控制器加載到容器中。

到目前爲止，所有這些工作正常，但正在加載的視圖控制器大小不同，並且將來可能會更改。我希望能夠允許（任意大小的）子視圖滾動。

我已經嘗試在滾動視圖中嵌入容器，但隨後作爲添加新子視圖的過程的一部分，您必須設置框架大小，但我希望孩子弄清楚它應該有多大然後設置一切。

我不完全知道什麼是最好的方式去了解這是（在故事板設置的限制，或以編程方式？）

任何意見將是巨大的！或者指向一個教程的鏈接將會非常有用，我唯一可以找到的就是將視圖控制器添加到容器視圖或將視圖添加到滾動視圖中，而這些視圖在Xcode 5（iOS 7）中似乎沒有像預期的那樣工作，

謝謝！

CNC中

這是我用來展示任意大小的詳細視圖控制器的代碼，其餘的一切都在故事板設置（以防萬一，這是在未來的有用的人！）這現在的作品：

- (void)presentDetailController:(UIViewController*)detailVC{ 

//0. Remove the current Detail View Controller shown 
if(self.currentDetailViewController){ 
    [self removeCurrentDetailViewController]; 
} 

//1. Add the detail controller as child of the container 
[self addChildViewController:detailVC]; 

//2. DO NOT Define the detail controller's view size 
//detailVC.view.frame = [self frameForDetailController]; 

//3. Add the Detail controller's view to the Container's detail view and save a reference to the detail View Controller 
[self.detailView addSubview:detailVC.view]; 
self.currentDetailViewController = detailVC; 

// Pin the height to the container to make it scrollable? 
[self.detailView addConstraint:[NSLayoutConstraint constraintWithItem:self.detailView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeHeight multiplier:1.0f constant:detailVC.view.bounds.size.height]]; 

//4. Complete the add flow calling the function didMoveToParentViewController 
[detailVC didMoveToParentViewController:self]; 

} 

Answer 1

您可以在任何地方設置約束並使其正常工作。祕訣是：您必須將容器視圖的約束設置爲包含它的滾動視圖的頂部，左側，底部和右側。然後Autolayout將根據容器視圖內部的內容正確計算滾動視圖的內容大小。

請參閱iOS 6發行說明中標題爲Pure Auto Layout Approach的小節。甚至有一些示例代碼。

// parentView is the thing you want to add the scroll view to 


// setup the scroll view, and add it to the parent view 
UIScrollView* scrollView = [[UIScrollView alloc] init]; 
scrollView.backgroundColor = [UIColor colorWithWhite:0.9f alpha:1.0f]; 

[parentView addSubview:scrollView]; 

scrollView.translatesAutoresizingMaskIntoConstraints = NO; 

NSDictionary* views = NSDictionaryOfVariableBindings(scrollView); 

[parentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[scrollView]|" options:0 metrics:nil views:views]]; 
[parentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[scrollView]|" options:0 metrics:nil views:views]]; 


// set up the content 
UILabel* firstLongLabel = [[UILabel alloc] init]; 
firstLongLabel.numberOfLines = 0; 
firstLongLabel.text = @" Four score and seven years ago our fathers brought forth, on this continent, a new nation, conceived in Liberty, and dedicated to the proposition that all men are created equal.\n\nNow we are engaged in a great civil war, testing whether that nation, or any nation so conceived, and so dedicated, can long endure. We are met on a great battle-field of that war. We have come to dedicate a portion of that field, as a final resting-place for those who here gave their lives, that that nation might live. It is altogether fitting and proper that we should do this."; 
firstLongLabel.backgroundColor = [UIColor greenColor]; 

UIButton* middleButton = [UIButton buttonWithType:UIButtonTypeSystem]; 
[middleButton setTitle:@"Middle Button" forState:UIControlStateNormal]; 
middleButton.backgroundColor = [UIColor purpleColor]; 

UILabel* lastLongLabel = [[UILabel alloc] init]; 
lastLongLabel.numberOfLines = 0; 
lastLongLabel.text = @"But, in a larger sense, we can not dedicate, we can not consecrate – we can not hallow – this ground. The brave men, living and dead, who struggled here, have consecrated it far above our poor power to add or detract. The world will little note, nor long remember what we say here, but it can never forget what they did here. It is for us the living, rather, to be dedicated here to the unfinished work which they who fought here have thus far so nobly advanced. It is rather for us to be here dedicated to the great task remaining before us – that from these honored dead we take increased devotion to that cause for which they here gave the last full measure of devotion - that we here highly resolve that these dead shall not have died in vain – that this nation, under God, shall have a new birth of freedom, and that government of the people, by the people, for the people, shall not perish from the earth."; 
lastLongLabel.backgroundColor = [UIColor yellowColor]; 


// now create a content view and add all of our previously created content to it 
UIView* contentView = [[UIView alloc] init]; 
contentView.backgroundColor = [UIColor blueColor]; 

[contentView addSubview:firstLongLabel]; 
[contentView addSubview:middleButton]; 
[contentView addSubview:lastLongLabel]; 

[scrollView addSubview:contentView]; 


// and now comes the important part.. the constraints 
firstLongLabel.translatesAutoresizingMaskIntoConstraints = middleButton.translatesAutoresizingMaskIntoConstraints = lastLongLabel.translatesAutoresizingMaskIntoConstraints = contentView.translatesAutoresizingMaskIntoConstraints = NO; 

views = NSDictionaryOfVariableBindings(firstLongLabel, middleButton, lastLongLabel, contentView); 

// first, add constraints dealing with the content inside the content view 
// these are simple and should be easily understood 
[contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-10-[firstLongLabel]-10-|" options:0 metrics:nil views:views]]; 
[contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-10-[middleButton]-10-|" options:0 metrics:nil views:views]]; 
[contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-10-[lastLongLabel]-10-|" options:0 metrics:nil views:views]]; 

[contentView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-10-[firstLongLabel]-10-[middleButton]-10-[lastLongLabel]-10-|" options:0 metrics:nil views:views]]; 

// then add constraints dealing with the content view that we put into the scroll view... 
// the trick here is that we lock the content to only partially the width 
// of the scroll view's parent. if we don't do that, then the labels will force the scroll 
// view to expand horizontally instead of vertically. 
// 
// as an exercise, you can try locking the left and right to the scroll view instead of the parent view to see what happens 
[parentView addConstraint:[NSLayoutConstraint constraintWithItem:contentView attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:parentView attribute:NSLayoutAttributeLeft multiplier:1 constant:10]]; 
[parentView addConstraint:[NSLayoutConstraint constraintWithItem:contentView attribute:NSLayoutAttributeRight relatedBy:NSLayoutRelationEqual toItem:parentView attribute:NSLayoutAttributeRight multiplier:1 constant:-10]]; 

// by locking the content view's vertical edges to that of the scroll view, it'll cause the 
// scroll view to expand vertically to accomodate the entire content view 
[scrollView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-10-[contentView]-10-|" options:0 metrics:nil views:views]];