更改屬性值

Question

我有兩個視圖控制器，aViewController和bViewController，bViewController是aViewController的子類。我在一個ViewController中聲明瞭一些屬性，在bViewController中我可以讀取該屬性的值，但是如果我嘗試更改它們的值，則該值不會更改，並且在更改前保持第一個值。

Answer 1

請確保您有這樣的事情：

// "A" view controller 
@interface AViewController : UIViewController 

@property (nonatomic, strong) NSString *name; 

@end 


// "B" view controller 
@interface BViewController : AViewController 

- (void)changePropertyValue; 

@end 

@implementation BViewController 

- (void)changePropertyValue 
{ 
    self.name = @"Bill"; 
    NSLog(self.name); 
    self.name = @"Steve"; 
    NSLog(self.name); 
} 

@end 

// create your BViewController 
BViewController *theController = [[BViewController alloc] init]; 
[theController changePropertyValue];