iOS Code

To create static shared object, that can be used across all view controllers .h + (id) sharedCustomAppController; .m static CustomApplicationController *sharedCustomAppController = nil; + (id) sharedCustomAppController {    @synchronized (self) {        if (sharedCustomAppController == nil) {            sharedCustomAppController = [[CustomApplicationController alloc] init];        }    }    return sharedCustomAppController ; }

NSError can be customised to deliver localized messages to the user. This is meant to show meaningful messages based on situations where and when error happens. 1. Create a strings file. As iOS supports localization, we need to add "strings" file to our project and add the error messages. "99" = "Exception occurred" "100" = "Login Successful."; "101" = "Logout failed"; "102" = "Unable to connect server"; "103" = "Invalid input data"; 2. Add two macro that would help to fetch the localized messages. #define ERROR_KEY(code)                    [NSString stringWithFormat:@"%d", code] #define ERROR_LOCALIZED_DESCRIPTION(code)  NSLocalizedStringFromTable(ERROR_KEY(code), @"Error", nil) // "Error" is the strings file name.

To enable debug logs in iOS application, add the following code in project PCH file. #if defined (DEBUGLOG) #define DebugLog( s, ... ) NSLog( @"%@", [NSString stringWithFormat:(s), ##__VA_ARGS__] ) #else #define DebugLog( s, ... ) #endif

To use hex code in UIColor, use the below macro. #define UIColorFromRGB(rgbValue) [UIColor \        colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 \        green:((float)((rgbValue & 0xFF00) >> 8))/255.0 \        blue:((float)(rgbValue & 0xFF))/255.0 alpha:1.0] //Then use any Hex value self.view.backgroundColor = UIColorFromRGB(0xD2691E);