問題描述

我以編程方式創(chuàng)建了一個(gè) UISCrollView，但我看不到滾動(dòng)條/指示器.

I programatically created a UISCrollView but i cant see the scrollbars/indicators.

UIScrollView * contentScrollView = [[UIScrollView alloc]initWithFrame:CGRectMake(760, 70, 205, 320)];
contentScrollView.delegate = self;
contentScrollView.scrollEnabled = YES;
contentScrollView.pagingEnabled = YES;
contentScrollView.userInteractionEnabled=YES;
contentScrollView.scrollsToTop = YES;
contentScrollView.showsVerticalScrollIndicator = NO;
contentScrollView.showsVerticalScrollIndicator = YES;
contentScrollView.alwaysBounceVertical = NO;
contentScrollView.alwaysBounceHorizontal = NO;
contentScrollView.bounces = NO;
contentScrollView.hidden = NO;
[contentScrollView flashScrollIndicators];
UILabel *titleLable = [[UILabel alloc] initWithFrame:CGRectMake(10, 10, 205, 40)];
UILabel *subtitleLable = [[UILabel alloc] initWithFrame:CGRectMake(10, 60, 205, 50)];
UITextView * mainContent = [[UITextView alloc]initWithFrame:CGRectMake(10, 110, 205, 230)];

[titleLable setText:@"...."];
[subtitleLable setText:@"SUbtitle"];
[mainContent setText:@"Descritpon"];
[contentScrollView addSubview:mainContent];
[contentScrollView addSubview:titleLable];
[contentScrollView addSubview:subtitleLable];

我將這段代碼添加到一個(gè)視圖中，該視圖再次附加到另一個(gè)更大的滾動(dòng)視圖.有誰知道為什么會(huì)這樣?同樣為簡(jiǎn)單起見，我將每個(gè)標(biāo)簽包含的文本減少為單詞，但在程序中我的文本足以滾動(dòng)

This code i add it to a view which is again attached to another bigger scrollview.. Does anyone know why this is the case? Also for simplicity i have reduced the text each lable contains to words but in the program i have the text is sufficient to scroll

謝謝..

推薦答案

要讓滾動(dòng)視圖滾動(dòng)，滾動(dòng)視圖的內(nèi)容大小必須大于其邊界.請(qǐng)?zhí)砑哟诵腥缓髾z查:

For the scroll view to scroll, the content size for the scroll view must be greater than its bounds. Please add this line and then check:

contentScrollView.contentSize=CGSizeMake(320, 250);

并將 contentScrollView.bounces 設(shè)置為 YES 并刪除 contentScrollView.showsVerticalScrollIndicator=YES 行，因?yàn)槟紫葘⒅翟O(shè)置為NO 然后 YES.

and also set the contentScrollView.bounces to YES and remove the line contentScrollView.showsVerticalScrollIndicator=YES as you have first set the value to NO and then YES.

這應(yīng)該可以完成工作.

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