iPhone，错误：无法设置对象-只读属性或未找到设置器

Question

I know there's another question like this on stack overflow, but my problem is from my own class not a UIButton. My method is a lot more complicated. The first commented line works.

@implementation GettingStartedViewController
- (void)actionSheet:(UIActionSheet *)actionSheet 
  clickedButtonAtIndex:(NSInteger)buttonIndex {

//[cui showHelpClickButtonAtIndex:buttonIndex:self.view:
  //theController:FALSE:HelpPageGettingStarted];

  // Error from this next line error: object cannot be set - either 
  //readonly property or no setter found 
  self.theController = [cui showHelpClickButtonAtIndex:buttonIndex:
      self.view:theController:FALSE:HelpPageGettingStarted];    
}
- (void)viewDidLoad {
   [super viewDidLoad]; 
cui = [CommonUI alloc]; // Used for several functions
}

And heres the function it calls. I've trying to reuse code and keep things in one function. the function uses addSubView and presentModalViewController .

@implementation CommonUI
-(UIViewController *)showHelpClickButtonAtIndex:(int)buttonIndex:
  (UIView *)vw:(UIViewController *)vc:(BOOL)useNav:(HelpPage)page{

  if (buttonIndex == CommonUIInfoHelpPagesBtnIdx) {
    if (useNav == TRUE) {
        // snip
    } else {
        vc = [[HelpViewController alloc] initWithNibName:@"HelpView" 
             bundle:nil onPage:page];   
        [vw addSubview:vc.view];
        return [vc autorelease]; 
    }
  } else {
    // Snip
  }
// Snip
}

Answer 1

The message says that there is no property for theController in GettingStartedViewController . Your method call works just fine.

self.theController = someObject is the same as calling the setter method: [self setTheController:someObject]

Properties automatically generate those getters and setters; so if you did not define a property, it is not going to create a setter and this is your problem here.

Add the following to your header file:

@property (nonatomic, retain) UIViewController* theController;

And synthesize it in your implementation file:

@synthesize theController;

Do not forget to release it in the -dealloc method, as you told the setter to retain the object:

-(void) dealloc {
    [theController release];
    theController = nil;
}

Answer 2

iPhone，错误：无法设置对象-当您尚未合成它并仍然访问其setter或/和getter方法时，出现readonly属性或找不到setter的错误。