[A gull's training note] [Objective-c] [Next day] [Personal notes]

Today I learned several ways to pass the value ... Just sticking to the notes from the class.

• I don't know what it's called. Use variables to pass values

  FirstViewController *firstVC = [[FirstViewController alloc] init];

    firstVC.str = _textField.text;

    [self.navigationController pushViewController:firstVC animated:YES];

• Single-case pass-through value

//SingleTon.m

static SingleTon * ton = nil;

+ (SingleTon *) shareTon {
If (ton == nil) {
         ton = [[SingleTon alloc] init];
     }
     return ton;
}

 

// write value

     SingleTon * ton = [SingleTon shareTon];
     ton.str = _textField.text;

 

// read value

SingleTon * ton = [SingleTon shareTon];
_Label.text = ton.str;

• Notification Pass Value

// Create a notification The name of the notification is name, and the content sent is a dictionary type

NSNotification * note = [[NSNotification alloc] initWithName: @ "name" object: self userInfo: [NSDictionary dictionaryWithObject: _textField.text forKey: @ "key"]];

// Send notification
[[NSNotificationCenter defaultCenter] postNotification: note];

// Receive notification Receive notification, execute (note :) function The name of the notification is name
[[NSNotificationCenter defaultCenter] addObserver: self selector: @selector (note :) name: @ "name" object: nil];

// Process notification
-(void) note: (NSNotification *) note {
     NSLog (@ "% @", [note.userInfo objectForKey: @ "key"]);
} 

[A gull's training note] [Objective-c] [Next day] [Personal notes]