添加UIScrollView到UIView時不能滾動

Question

我想添加一個滾動視圖到我的UIView，並把標籤，textview，圖像，但滾動條不顯示，我不能滾動。

//faux view 
UIView* fauxView = [[[UIView alloc] initWithFrame: CGRectMake(10, 10, 200, 200)]autorelease] ; 
[self.bgView addSubview: fauxView]; 

//the new panel 
self.bigPanelView = [[[UIView alloc] initWithFrame:CGRectMake(0, 0, self.bgView.frame.size.width, self.bgView.frame.size.height)]autorelease]; 
self.bigPanelView.center = CGPointMake(self.bgView.frame.size.width/2, self.bgView.frame.size.height/2); 
self.bigPanelView.backgroundColor = self.initialBackgroundColor; 


UIScrollView * scroll = [[UIScrollView alloc] initWithFrame:self.bigPanelView.bounds]; 
[scroll setContentSize:CGSizeMake(200, 200)]; 
[self.bigPanelView addSubview:scroll]; 
scroll.showsVerticalScrollIndicator = YES; 



// add label 

UILabel *lblTitle = [[[UILabel alloc] initWithFrame:CGRectMake(0, 25, self.bgView.frame.size.width, 46)]autorelease]; 
// If I change the 25 to 235 the label will come under the screen but still I cannot scroll. 
lblTitle.textAlignment = NSTextAlignmentCenter; // Align the label text in the center 
lblTitle.backgroundColor = [UIColor clearColor]; 
lblTitle.text = self.initialTitle; 
lblTitle.textColor = self.initialTitleColor; 
lblTitle.font = [UIFont systemFontOfSize:31]; 
[scroll addSubview: lblTitle]; 

Answer 1

你必須要滾動視圖的contentSize超過視圖大小：

[scroll setContentSize:CGSizeMake(200, 200)]; 

需求是這樣的：

[scroll setContentSize:CGSizeMake(400, 400)]; 

當然，作出這樣的內容的大小，無論你」重新放置滾動視圖，這樣，它只會滾動，如果需要。

Answer 2

對於滾動 - scrollView的contentSize應該大於scrollView的框架。