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Under Build Phases ---> Compile sources,

Double click on a file and add this flag to disable ARC on that particular file:

-fno-objc-arc

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// implement the following code in AppDelegate.m
// implement a dummy method "canRotate" in the ViewController that you want to rotate

#pragma mark - Rotation methods

-(NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window {
    
    // Get topmost/visible view controller
    UIViewController *currentViewController = [self topViewController];
    

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// resize UIImages
https://github.com/mustangostang/UIImage-ResizeMagick


// style practices
https://github.com/raywenderlich/objective-c-style-guide


// custom tab bar controller
https://github.com/levey/LeveyTabBarController

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//
//  SejoPaddingLabel.h
//  GiftyOne
//
//  Created by Esense-33 on 18/07/14.
//  Copyright (c) 2014 GiftyOne. All rights reserved.
//

#import <UIKit/UIKit.h>

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//
//  GolopoTextField.h
//  Golopo
//
//  Created by Esense-15 on 05/09/14.
//  Copyright (c) 2014 esense. All rights reserved.
//

#import <UIKit/UIKit.h>

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//
//  UIApplication+AppDimensions.m
//  GolfByJordan
//
//  Created by sudeep on 26/08/14.
//  Copyright (c) 2014 Esense. All rights reserved.
//

#import "UIApplication+AppDimensions.h"

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//
//  UIImage+Mask.h
//  Golopo
//
//  Created by Esense-15 on 22/09/14.
//  Copyright (c) 2014 esense. All rights reserved.
//

#import <UIKit/UIKit.h>

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Stuck at authenticating with iTunes store:

Go to: Applications > Xcode > Contents > Applications > Application Loader > Contents > MacOS > itms > java > lib - Open net.properties with TextEdit and change the line # https.proxyPort=443 to # https.proxyPort=80

Link: http://stackoverflow.com/questions/18971710/application-loader-stuck-at-the-stage-of-authenticating-with-the-itunes-store

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+ (BOOL)validateForEmail:(NSString *)email {
	
	NSString *regExPattern = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
	NSRegularExpression *regEx = [[NSRegularExpression alloc] initWithPattern:regExPattern options:NSRegularExpressionCaseInsensitive error:nil];
	NSUInteger regExMatches = [regEx numberOfMatchesInString:email options:0 range:NSMakeRange(0, email.length)];
	
	if (regExMatches == 0) {
		return NO;
	} else {
		return YES;

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+ (instancetype)sharedManager {
    static ClassName *sharedManager = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        sharedManager = [[self alloc] init];
    });
    return sharedManager;
}