Class hierarchy of UIResponder as well as subclasses of UIView and UIControl

最新推荐文章于 2024-09-25 09:35:33 发布

转载最新推荐文章于 2024-09-25 09:35:33 发布 · 213 阅读

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原文链接：http://www.cnblogs.com/davidgu/p/3805521.html

本文详细介绍SwiftUI编程的基础知识，包括视图创建、布局设计及交互实现。通过具体实例讲解如何在iOS开发中运用SwiftUI进行高效界面搭建，适合初学者快速上手。

When you were dragging in your label and your button to this view, you were adding them as subviews.
By doing this programmatically you can see what goes into adding a subview. You’d
need to pass in a frame to the alloc:initWithFrame: method, which is found on
most UIView subclasses:

CGRect frame = CGRectMake(0,0,100,20);
UILabel *label = [[UILabel alloc] initWithFrame:frame];

// To add this label to its parent view within a view controller, all you have to
// do is use the addSubView: function.
[self.view addSubView:label];

// Retrieving the frame, making a change to its size or origin, and then 
// resetting its frame property
CGRect frame = label.frame;
frame.origin.x = 10;
frame.size.width = 200;
[label setFrame:frame];