iOS Day 10

AppDelegate1.h

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;
@property (strong, nonatomic) NSString *info;

@end

AppDelegate1.m

@implementation AppDelegate

-(void)doSomethingWithString:(NSString*)parameter {
    self.info = parameter;
}

-(NSString*)getInfo {
    return self.info;
}

AppDelegate2.h

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;
@property (strong, nonatomic) NSString *info;

-(void)doSomethingWithString:(NSString*)parameter;
-(NSString*)getInfo;

@end

MySingleton.h

@interface MySingleton : NSObject{
    NSString *info;
}

+(MySingleton*) getInstance;

-(void)doSomethingWithString:(NSString*)parameter;
-(NSString*)getInfo;

@end

MySingleton.m

#import "MySingleton.h"

@implementation MySingleton

static MySingleton *singletonInstance;

+ (MySingleton*)getInstance{
    if (singletonInstance == nil) {
        singletonInstance = [[super alloc] init];
    }
    return singletonInstance;
}

-(void)doSomethingWithString:(NSString*)parameter {
    info = parameter;
}

-(NSString*)getInfo {
    return info;
}

@end

ViewController.h

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController
- (IBAction)tappedSaveData:(id)sender;
- (IBAction)tappedLoadData:(id)sender;
@property (weak, nonatomic) IBOutlet UILabel *lblInfo;

@end

ViewController1.m

- (IBAction)tappedSaveData:(id)sender {
    AppDelegate *delegate = [UIApplication sharedApplication].delegate;
    delegate.info = @"Some text!";
}

- (IBAction)tappedLoadData:(id)sender {
    AppDelegate *delegate = [UIApplication sharedApplication].delegate;
    [self.lblInfo setText:delegate.info];
}

ViewController2.m

- (IBAction)tappedSaveData:(id)sender {
    AppDelegate *delegate = [UIApplication sharedApplication].delegate;
    [delegate doSomethingWithString:@"some text"];
}

- (IBAction)tappedLoadData:(id)sender {
    AppDelegate *delegate = [UIApplication sharedApplication].delegate;
    [self.lblInfo setText:[delegate getInfo]];
}

ViewController3.m

- (IBAction)tappedSaveData:(id)sender {
    //    AppDelegate *delegate = [UIApplication sharedApplication].delegate;
    //    [delegate doSomethingWithString:@"some text"]
    MySingleton* singleton = [MySingleton getInstance];
    [singleton doSomethingWithString:@"some text"];
}

- (IBAction)tappedLoadData:(id)sender {
    //    AppDelegate *delegate = [UIApplication sharedApplication].delegate;
    //    [self.lblInfo setText:[delegate getInfo]];
    MySingleton* singleton = [MySingleton getInstance];
    [self.lblInfo setText:[singleton getInfo]];
}