ios 将调试消息写入 Xcode 输出窗口
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Write debug messages to Xcode output window
提问by Tyrel Van Niekerk
I have see this in sample objective c code before, but can't find it now and all the searches come back with irrelivent results.
我之前在示例目标 c 代码中看到过这个，但现在找不到它，所有搜索都返回无关紧要的结果。
I want to write debug messages to the Xcode output window. What's the command to do that? Basically like System.Diagnostics.Debug.WriteLine for C#.
我想将调试消息写入 Xcode 输出窗口。这样做的命令是什么？基本上就像 C# 的 System.Diagnostics.Debug.WriteLine。
回答by Will Pragnell
NSLog(@"Your message here");
...should do it.
……应该这样做。
To include data from variables you can use string formatting, e.g:
要包含变量中的数据，您可以使用字符串格式，例如：
NSLog(@"Value of string is %@", myNSString);
There are a bunch of different string format specifiers, you can look at them here: https://developer.apple.com/library/content/documentation/Cocoa/Conceptual/Strings/Articles/formatSpecifiers.html
有很多不同的字符串格式说明符，你可以在这里查看它们：https: //developer.apple.com/library/content/documentation/Cocoa/Conceptual/Strings/Articles/formatSpecifiers.html
回答by sch
You are looking for NSLog. Calling
您正在寻找NSLog. 打电话
NSLog(@"Message");
will print Messageon the console.
将打印Message在控制台上。
See herefor more info about how to use string formatters to print the values of variables like in the examples below:
有关如何使用字符串格式化程序打印变量值的更多信息，请参见此处，如下例所示：
NSLog(@"This is a string: @", aString);
NSLog(@"This is an int: %d", anInt);
回答by StevenHolland
It's better to write the debug messages using debugger breakpoints instead of cluttering your code with NSLog messages. Breakpoints will also save you from having to remove all those log messages when you ship your app.
最好使用调试器断点编写调试消息，而不是用 NSLog 消息使代码混乱。断点还可以让您在发布应用程序时不必删除所有这些日志消息。
To do this, set a breakpoint in Xcode, double-click on it, and click the Add Action button in the pop-up window. Select "Log Message" and type your message. Check the "Automatically continue after evaluating" check box at the bottom to keep it from pausing execution on the breakpoint
为此，在 Xcode 中设置一个断点，双击它，然后单击弹出窗口中的 Add Action 按钮。选择“日志消息”并键入您的消息。选中底部的“评估后自动继续”复选框，以防止它在断点处暂停执行
