问题描述
今天开始观看WWDC视频，了解xCode 4中的新功能。他们提到，在断点上使用日志消息操作以及例如，在执行评估操作后自动继续能够输出变量值而不是例如一直使用NSLogs。
Been watching a WWDC video today about new features in xCode 4. They have mentioned that it a good idea to use log message actions on breakpoints along with "automatically continue after evaluation actions" enabled to output a variable's value for instance instead of using NSLogs all the time.
让我说这样的话：
NSLog(@"URL is : %@", userDocumentsURL);
我该如何编写日志消息操作以显示userDocumentsURL的值？
How would I write a log message action to display userDocumentsURL's value? Is it really a good idea to use the above method instead of NSLog?
推荐答案
创建断点日志消息操作，真的是个好主意吗？对于日志消息，包括以下内容：
Create a Breakpoint 'Log Message' action. For the log message include something like:
URL is @(char*) [[userDocumentsURL description] UTF8String]@
或者，您可以创建一个断点 Debugger command操作，类似于：
Alternatively you can create a breakpoint 'Debugger command' action similar to:
po [NSString stringWithFormat:@"URL is: %@", userDocumentsURL]
我更喜欢使用断点操作进行日志记录，因为清除一堆断点可能比删除NSLogs容易得多。以这种方式使用断点的可能缺点是（在调试过程中）断点比直接使用NSLog慢得多。
I prefer using breakpoint actions for logging, as it's arguably easier to clear out a bunch of breakpoints than it is to remove NSLogs. A possible downside to using breakpoints in this fashion is that they are significantly slower (during debugging) than a direct NSLog.
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