Tips and Tricks Archives

Creating a NSDictionary Object With Multiple Objects and Keys

Tuesday, April 30th, 2013 at 10:27 am  
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How to Execute Javascript in UIWebView?

Tuesday, April 30th, 2013 at 10:05 am  
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It is possible to execute javascript codes on the webpage loaded in a UIWebView. We can use stringByEvaluatingJavaScriptFromString: method of UIWebView object for this.

This method can be used once the url has been loaded in the web view as follows :

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How to Enable and Disable Battery Monitoring using Xcode?

Wednesday, April 24th, 2013 at 6:55 am  
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We will have to use the batteryMonitoringEnabled property of the device for enabling and disabling battery monitoring using Xcode.

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Converting Number to Percentage in Xcode

Wednesday, April 24th, 2013 at 6:50 am  
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“Could not change executable permissions on the application.” – Error in Xcode

Thursday, March 21st, 2013 at 7:04 am  
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This error occurs when you try to install an app into the device via xcode. This means that there is already an app in the device with the same bundle id, whose executable is mismatching with the new one you are trying to install. To fix this, you have to delete the old app with the same bundle id from the device.

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Fixing Undefined Symbols While Integrating Testflight in IOS

Thursday, March 21st, 2013 at 6:32 am  
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The common undefined symbol error appearing while integrating test flight will be something like the following :

Undefined symbols for architecture armv7s:

“_deflateInit_”, referenced from:

_compress_data in libTestFlight.a(tf_compression.o)

“_deflateEnd”, referenced from:

_compress_data in libTestFlight.a(tf_compression.o)

“_deflate”, referenced from:

_compress_data in libTestFlight.a(tf_compression.o)

ld: symbol(s) not found for architecture armv7s

clang: error: linker command failed with exit code 1 (use -v to see invocation)

 

The fix for this issue is simple.

Goto the build phases of the target for which the issue is appearing. In the link binary with libraries section, use the ‘+’ button at the bottom to add a new library. In the dialog box which appears, search for libz.dylib . You will see the library in the list. Select that and press the ‘Add’ button.

Now perform a build clean for the project and you are done.

Build the app and the issue will be fixed.

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Getting the Child View Controllers of a View Controller in Xcode

Friday, March 8th, 2013 at 8:01 am  
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We can get the child view controllers of a view controller using the childViewControllers property of the view controller.

If we are in a view controller class, if we want to get its child view controllers, then we can use the following code :

self.childViewControllers;

This will return an array of view controllers that are the child of the current view controller.

If there are no child view controllers of the current view controller, then the array will be empty.

 

If we are to get the child view controllers of a navigation controller, we can use the following code :

self.navigationController.childViewControllers;

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Passing Multiple Parameters to PerformSelector Method in Xcode

Friday, March 8th, 2013 at 7:55 am  
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It is possible to pass a single parameter to performSelector: method in Xcode using the following method :

 

[self performSelector:@selector(selectorNamewithArg:) withObject:param];

 

But what to do if we have to pass multiple parameters? There is a way to pass upto two parameters to the performSelector: method. It can be implemented using the following method :

 

[self performSelector:@selector(selectorNamewithArg1: Arg2:) withObject:param1 withObject:param2];

 

Here, two parameters are passed to the selector method.

 

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How to Boot to a Different OS in Dual-boot Mac

Wednesday, February 20th, 2013 at 1:28 pm  
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You can use Bootcamp to install install windows OS on a mac machine. Once your system is ready with windows OS and a mac OS, you can switch between the OS using the following methods :

 

- For the first and the simplest method, restart the Mac and while restarting, press the Alt button on the keyboard. This will bring the option to choose the OS you want to use.

- Another method you can use is using the system preferences. Choose startup disk from the system preferences items. In the window which appears, you will be able to see the partitions and OS installed in the mac. From there choose the partition you want to boot to and click the “Restart…” button. Now your mac will restart with the OS you have selected.

 

These are the two simple and easy steps to switch OS in dual boot mac.

Keyboard Shortcut to Open Task Manager in Mac

Friday, February 15th, 2013 at 11:56 am  
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It is possible to open task manager in mac using keyboard shortcut. The keyboard shortcut used for this is :

Alt + Cmd + Esc

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