swift: Using UIApplication Subclass in main.m

Make the swift class like this

import UIKit

import Foundation

@objc(MyTest2) class MyTest2: UIApplication

{

    

    

  

    

}

and modify the main.m

#import <UIKit/UIKit.h>

#import "AppDelegate.h"

#import "test3-swift.h"  //test3 is the project name, not a real file in project

int main(int argc, char * argv[]) {

    @autoreleasepool {

        return UIApplicationMain(argc, argv, NSStringFromClass([MyTest2 class]), NSStringFromClass([AppDelegate class]));

    }

}

Objective-c Getting device width programmatically

CGFloat width = [UIScreen mainScreen].bounds.size.width;

Swift: conditional unwrapping, checking error is nil or not

var error: NSError?

// now use error in functions like

audioSession.overrideOutputAudioPort(AVAudioSessionPortOverride.None, error: &error)

//and now conditional unwrapped

 if let routeChangeError = error {

            NSLog("error %@",routeChangeError)

  }

Swift: changing AVAudioSession route (voice from speaker to headphone and vice versa)

 NSNotificationCenter.defaultCenter().addObserver(self, selector: "handleAVAudioSessionRouteChange:", name: AVAudioSessionRouteChangeNotification, object: nil)

@objc private func handleAVAudioSessionRouteChange(notification : NSNotification) {

        

        println("change route \(notification.userInfo)")

        let audioSession = AVAudioSession.sharedInstance()

        var error : NSError?

        let audioRouteChangeReason = notification.userInfo![AVAudioSessionRouteChangeReasonKey] as UInt

        

        switch audioRouteChangeReason {

        case AVAudioSessionRouteChangeReason.NewDeviceAvailable.rawValue:

            println("headphone plugged in")

        audioSession.overrideOutputAudioPort(AVAudioSessionPortOverride.None, error: &error)

        case AVAudioSessionRouteChangeReason.OldDeviceUnavailable.rawValue:

            println("headphone pulled out")

            audioSession.overrideOutputAudioPort(AVAudioSessionPortOverride.Speaker, error: &error)

        default:

            break

        }

    }

Swift NSUserDefault

setting  

NSUserDefaults.standardUserDefaults().setObject(myvalue, forKey: "mykey")

        NSUserDefaults.standardUserDefaults().synchronize()

reading

Swift

1 2 3 4 5

let defaults = NSUserDefaults.standardUserDefaults() if let name = defaults.stringForKey("myKey") {     println(name) }

stringForKey

IntegerForKey

ObjectForKey 

use based on requirements 

swift - Function with parameter and return value

• func sayHello(personName: String) -> String {
• let greeting = "Hello, " + personName + "!"
• return greeting
• }

objective-c gesture recognizer calling multiple time till state end

In viewdidLoad

UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)];

    longPress.minimumPressDuration=1.0f;

    [self.deleteDigitButton addGestureRecognizer:longPress];

Long press button

timer is being used to call itself through longPress timer function

- (void)longPress:(UILongPressGestureRecognizer*)gesture {

    

    if( gesture.state == UIGestureRecognizerStateBegan ) {

        NSLog(@"DialerViewController.Long Press");

        

        NSString *digits = [PhoneNumberFormatter unformat: self.TextField.text];

        if(digits.length > 0 && (gesture.state != UIGestureRecognizerStateEnded || gesture.state != UIGestureRecognizerStateCancelled || gesture.state != UIGestureRecognizerStateFailed)) {

            digits = [digits substringToIndex:digits.length - 1];

            self.TextField.text = [PhoneNumberFormatter format:digits];

            [self.TextField setNeedsDisplay];

            

            NSTimeInterval timeInterval = 0.1; //seconds

            [NSTimer scheduledTimerWithTimeInterval:timeInterval

                                             target:self

                                           selector:@selector(longPressTimer:)

                                           userInfo:gesture

                                           repeats:NO];

            

        }

    }

}

longPressTimer function

-(void)longPressTimer:(NSTimer *)timer{

    UILongPressGestureRecognizer *gesture = [timer userInfo];

    [self longPress:gesture];

}