String value encountered a warning message, record it
Sending 'const NSString *__strong' to parameter of type 'NSString *' discards qualifiers
The code is written like this
UIKIT_EXTERN const NSString * kNetworkType;
This warning will be issued when using it, and it will be changed to:
UIKIT_EXTERN NSString * const kNetworkType;
If const is placed after nsstring *, there will be no warning.
Xcode is upgraded to 12.4. When you run iPhone 12 online, you will be prompted with errors were accounted while preparing your device for development. Please check the devices and simulators window.
About warnings
We define a block without parameters, usually in the following way
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A warning is prompted in xcode9
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The solutions can be as follows
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But in this way, many third parties need to change, the scope involved is too large, it may not be suitable at present, although this is the trend
Or, if it’s only a few places, it can be used
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A complete temporary solution to all such warnings
In the setting of the project
Set to no, the warnings disappear
However, this is not a good habit. It’s just a temporary way not to prompt this type of warning
Xcode error:
Could not launch “” Domain: IDEDebugSessionErrorDomain Code: 3 Failure Rea
before test has been on the iPhone, after changed the error as above.
Reason:
did not trust its own description management account when debugging a new device for the first time.
The solution:
in the description of the management and trust his account.
An error occurred while debugging a project on ios
unable to find utility “instruments”, not a developer tool or in PATH
The default version
is not set when xcode has been upgraded or when multiple versions of xcode coexist
Open up Xcode and select
Go to Locations, and select the version you want to use in Command Line Tools
At this point, exit Xcode completely and try run-ios again. Everything is ok!
xcode-select --installAfter entering, the system will pop up and download the Xcode component. Click “Ok” and the download will be completed.
xcode-select: note: install requested for command line developer tools
Problem analysis
At first, I thought the SVN path was incorrect, but it was correct after repeated confirmation.
If you think SVN is gone, consider the MAC’s own Subversion can’t go wrong.
Finally, In SVN — Version, I was given an error notification prompt:
xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun
And Then I Command C, Command V, and I open Baidu, and I do it all at once.
The problem summary
A lot of Mac software relies on xcode’s precursors.
Error contents:
Solutions:
Small make up in a small demo letter about ring, ring of import letter SDK (EaseMobSDK), the connection of the error, as shown in the figure below:
solution is in general, the following figure, respectively, in the absence of label arrow to add compiler needs. M files and the necessary framework:
and the small make up the problem here is not more than compile files and framework problem, the solution is,
in the third arrow to add: -obJC, and then you just recompile.
I believe that many people have encountered this problem, the Internet is also by a variety of answers which this calculate more comprehensive
The reason for the error is the project — > in Xcode; The scheme – & gt; Edit scheme – & gt; The options – & gt; The core location – & gt; Error allowing location simulation; 
solutions:
Most people should have solved the problem, but I didn’t… And the solution is this
It’s not because I’m in Hong Kong. It’s because there’s only one Chinese in Hong Kong.
will not report an error after it is set. In fact, it is to specify the position of the simulator. I don’t know why the simulator cannot be automatically positioned, so I can test with the real machine
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