objective-c - IOS:处理一个对象

Question

我有这个代码:

-(IBAction) doSomething{ 
FirstViewController *firstViewController = [[[FirstViewController alloc]init]autorelease];
[firstViewController.label1 setAlpha:1.00];
[firstViewController.label2 setAlpha:1.00];
}

-(void) do{
//use firtsViewController in this method
}

正如您在示例中看到的那样，我使用了 FirstViewController 类的对象“firstViewController”，但是如果我想在方法“do”中使用相同的对象呢？我该怎么办

Answer 1

在标题中有...

FirstViewController *firstViewController;

然后将您的方法替换为...

-(IBAction) doSomething{ 
if(firstViewController == nil) {
  firstViewController = [[FirstViewController alloc]init];
}

[firstViewController.label1 setAlpha:1.00];
[firstViewController.label2 setAlpha:1.00];
}

并添加..

- (void)dealloc {
  [firstViewController release];
  [super dealloc];
}