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Archive for the ‘iPhone Dev’ Category

Check if user’s ios version is iOS 6 + or not.

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if (NSClassFromString(@”SLComposeViewController”) != Nil)
     // iOS6

}    else

{        // iOS 5, Social.framework unavailable, use Twitter.framework instead


Written by admin

April 28th, 2013 at 3:03 pm

Posted in iPhone Dev

iOS6 EKEventStore requires users grant access before getting any calender / reminder data.

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ios App wont be able get any data from the Calendar on the iOS6 system if you don’t call the requestAccessToEntityType function to prompt a dialog to ask your users to grant access to your app to access the Calendar/Reminder. Below is the sample code:


EKEventStore    *eventStore = [[EKEventStore alloc] init];

//— This method “checkIsDeviceVersionHigherThanRequiredVersion” can be remove and use the official method to detect if user is using ios6 or later.

//—if([self checkIsDeviceVersionHigherThanRequiredVersion:@”6.0″]) {

if([eventStore respondsToSelector:@selector(requestAccessToEntityType:completion:)]) {
// iOS 6 and later
[eventStore requestAccessToEntityType:EKEntityTypeEvent completion:^(BOOL granted, NSError *error) {

// perform the main thread here to avoid any delay. normally seems to be 10 to 15 sec delay.
[self performSelectorOnMainThread: @selector(presentEventEditViewControllerWithEventStore:) withObject:eventStore waitUntilDone:NO];


if (granted){
//—- codes here when user allow your app to access theirs’ calendar.

//—– codes here when user NOT allow your app to access the calendar.






– (void)presentEventEditViewControllerWithEventStore:(EKEventStore*)eventStore
EKEventEditViewController* eventEditVC = [[EKEventEditViewController alloc] init];
eventEditVC.eventStore = eventStore;

EKEvent* event = [EKEvent eventWithEventStore:eventStore];
event.title = @”My Event”;
event.startDate = [NSDate date];
event.endDate = [NSDate date];
event.URL = [NSURL URLWithString:@”http://www.idavid.com.au”];
event.notes = @”This is just a test event.”;
event.allDay = YES;
eventEditVC.event = event;

eventEditVC.editViewDelegate = self;

[self presentViewController:eventEditVC animated:YES completion:nil];




//   Below is a block for checking is current ios version higher than required version.


– (BOOL)checkIsDeviceVersionHigherThanRequiredVersion:(NSString *)requiredVersion
NSString *currSysVer = [[UIDevice currentDevice] systemVersion];

if ([currSysVer compare:requiredVersion options:NSNumericSearch] != NSOrderedAscending)
return YES;

return NO;

Written by admin

September 21st, 2012 at 1:40 am

Posted in iPhone Dev

iOS 5 Weird Behavior with the UISegmentedControl setDividerImage

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I’m using the appearance feature in the iOS 5 to customise the UISegmentedControl. Initially I was using the standard way to define different images for different divider status, it working fine when I tapped on each item. But when I set up the initial selected value to anything that rather than 0 (Zero), the divider behavior very weird:




* Images for different status:

Normal – Normal
Selected – Normal
Normal – Selected




// — Images for divider at different status.

UIImage *imgSelectedUnSelected = [[UIImage imageNamed:@”segments-selected-unselected.png”] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 0, 0, 0)];
UIImage *imgUnSelectedUnSelected = [[UIImage imageNamed:@”segments-unselected-unselected.png”] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 0, 0, 0)];
UIImage *imgUnSelectedSelected = [[UIImage imageNamed:@”segments-unselected-selected.png”] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 0, 0, 0)];

// — Dividers
[[UISegmentedControl appearance] setDividerImage:imgSelectedUnSelected forLeftSegmentState:UIControlStateSelected rightSegmentState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
[[UISegmentedControl appearance] setDividerImage:imgUnSelectedUnSelected forLeftSegmentState:UIControlStateNormal rightSegmentState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
[[UISegmentedControl appearance] setDividerImage:imgUnSelectedSelected forLeftSegmentState:UIControlStateNormal rightSegmentState:UIControlStateSelected barMetrics:UIBarMetricsDefault];



The way to fix this issue, I use a 1 pixel width image for the divider instead of the 3 different images above.

1 pixel divider imag


// — Dividers 1pixel images

UIImage *imgSelectedUnSelected = [[UIImage imageNamed:@”segment-divider.png”] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 0, 0, 0)];
UIImage *imgUnSelectedUnSelected = [[UIImage imageNamed:@”segment-divider.png”] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 0, 0, 0)];
UIImage *imgUnSelectedSelected = [[UIImage imageNamed:@”segment-divider.png”] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 0, 0, 0)];


It works fine now:



Written by admin

August 12th, 2012 at 6:11 pm

Adding code autoformat feature for your xCode

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If you have been looking for the same codes auto-format feature in the xCode like what you have in the other famous IDE such as Visual Studio.net or Eclipse, you will be disappointed. Unfortunately up to the latest version of the xCode (version 4.4), there aren’t any good auto-format feature built-in. The only one that you might be able to get is the basic code re-indent function.

In this post I will show you how to use the Uncrustify (http://uncrustify.sourceforge.net/) to add auto-format feature into the xCode.


STEP 1: We will need to install the Uncrustify on to your mac. The easiest way to install it is through the Homebrew.

* Install the Homebrew: Copy and paste this line of code to your command console:

ruby <(curl -fsSk https://raw.github.com/mxcl/homebrew/go)


Next is to install the Uncrustify – just simply copy and paste this command into your command console:

brew install uncrustify


SETP 2: You will need to download this Automate workflow file

unzip and then move it to the ~/Library/Services/ folder.  You can go the the folder that you downloaded the Automate workflow file and run the following commands:

mv Uncrustify-Objective-C.workflow.tar.gz ~/Library/Services/ cd ~/Library/Services/ tar zxvf Uncrustify-Objective-C.workflow.tar.gz



STEP 3: Download the pre set Uncrustify File for the Object-C: Unzip it > Rename it to  .uncrustify_obj_c.cfg  (Please note that there is a dot in front of the file name)and then move it to the ~/ folder by using the below commands:

 mv uncrustify_obj_c.txt ~/.uncrustify_obj_c.cfg

* The format can be customised by modifying the uncrustify_obj_c.txt file before moving to the ~/ folder. Just open the txt file and modify the row that relevant to your style. Each setting has been commented, should be very easy to be customised.


STEP 4: Set up the keyboard short cut for autoformat feature.

Go to the “System Preferences – Keyboard – Keyboard Shortcuts – Service” and then look for the newly added services item “Uncrustify Objective-C”. Here is the place that you can add the shorcut for the autoformat feature. Please keep in mind that don’t use any shor cut that might conflict with what xCode already using. The recommended one: “Option + Command + O”, this combination shouldn’t conflict with the xCode pre-set ones.


Enjoy it.

Written by admin

August 11th, 2012 at 4:21 pm

iBabe Alpha is On the GitHub Now!

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After 3 months learning and development process the iOS version of iBabe Ver.Alpha has finally been released. Koumei and I am preparing for app testing, bug fixing and also optimizing the codes.

====  GitHub URL: https://github.com/davidliang/iBabe.git  ======



Written by admin

July 29th, 2012 at 1:17 pm

Posted in iPhone Dev

Custom UITableViewCell Error (with screenshot)

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Error Msg:

Terminating app due to uncaught exception ‘NSUnknownKeyException’, reason: ‘[TheViewController setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key XYZ


In the Interface Builder,

Set  the File’s Owner of your Custom  Table Cell  XIB to UITableViewCell;

Set your custom table cell controller to the UITableViewCell:

Written by admin

January 9th, 2011 at 8:18 am

Posted in iPhone Dev