February 2017
Beginner to intermediate
472 pages
9h 53m
Chinese
Content preview from Swift学习手册
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
30
｜
第
1
章
@IBAction func showAlert(sender: AnyObject) {
}
4.
在前面创建的
showAlert
方法中添加下述代码：
var alert = UIAlertController(title: "Hello!", message: "Hello, world!",
preferredStyle: UIAlertControllerStyle.Alert)
❶
alert.addAction(UIAlertAction(title: "Close",
style: UIAlertActionStyle.Default, handler: nil))
❷
self.presentViewController(alert, animated: true, completion: nil)
❸
self.helloButton.setTitle("Test!", forState: UIControlState.Normal)
❹
这些代码的作用是：
❶
创建一个
UIAlertController
实例，在弹出的窗口中显示一个消息。这个窗口的
标题是“
Hello!
”，里面的文本是“
Hello, world!
”。
❷
添加关闭提示框的操作，文本是“
Close
”。
❸
向用户显示提示框。
❹
最后，把按钮的标题设为“
Test!
”。
现在，应用可以运行了。单击左上角的运行按钮，应用会在
iPhone
模拟器中启动。
首次启动应用时要等一会儿，别着急。首次启动模拟器可能要用相当长的时间。 ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.