UIScrollView 例子

最新推荐文章于 2016-10-09 18:18:29 发布

原创最新推荐文章于 2016-10-09 18:18:29 发布 · 121 阅读

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本文介绍如何使用 Objective-C 创建一个可以缩放的 UIScrollView，并设置其内容大小超过视图区域，实现平移和缩放功能。

	CGRect wholeWindow = CGRectMake(0.0, 0.0, self.view.frame.size.width, self.view.frame.size.height);
	UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:wholeWindow];
	[self.view addSubview:scrollView];
	[scrollView release];
	CGRect reallyBigRect;
	reallyBigRect.origin = CGPointZero;
	reallyBigRect.size.width = wholeWindow.size.width * 1.2;
	reallyBigRect.size.height = wholeWindow.size.height * 2.0;
	[scrollView setContentSize:reallyBigRect.size];
	
	CGPoint offset;
	offset.x = 0.0;
	offset.y = 0.0;
	[scrollView setContentOffset:offset];
	
	[scrollView setMinimumZoomScale:0.5];
	[scrollView setMaximumZoomScale:5];
	[scrollView setDelegate:self];
	
	summaryView = [[ProjectSummaryView alloc]  initWithFrame:reallyBigRect];
	
	[summaryView setBackgroundColor:[UIColor clearColor]];
	[scrollView addSubview:summaryView];