关于IBOutlet的生命周期

在调试程序的时候，发现 IBOutlet的对象在执行 getter时,开始一直想找IBOutlet对象getter方法前被执行的代码,但是一直找不到，于是我就想是不是系统自动给IBOutlet 自动初始化了，于是做了一个实验，得出一个结论IBOutlet对象getter方法 会在awakeNib之后但在viewDidload后进行初始化。

当上一个视图 Segue 传递过来的一个变量,那么是先执行 -(void) awakeFromNib 然后在执行变量的setter方法

- (void)viewDidLoad

{

    NSLog(@"ViewDidLoad!");

    [super viewDidLoad];

    [self.scrollView addSubview:self.imageView];

}



- (void) awakeFromNib{

    NSLog(@"awakeFromNib");

    self.splitViewController.delegate = self;

}



-(void)setSpinner:(UIActivityIndicatorView *)spinner{

    NSLog(@"IBAction Spiner");

}



- (void)setScrollView:(UIScrollView *)scrollView

{

    NSLog(@"IBAction ScrollView");

    _scrollView = scrollView;

    

    // next three lines are necessary for zooming

    _scrollView.minimumZoomScale = 0.2;

    _scrollView.maximumZoomScale = 2.0;

    _scrollView.delegate = self;



    // next line is necessary in case self.image gets set before self.scrollView does

    // for example, prepareForSegue:sender: is called before outlet-setting phase

    self.scrollView.contentSize = self.image ? self.image.size : CGSizeZero;

}







//output：

2014-11-06 17:11:13.216 Photomania[760:60b] awakeFromNib

2014-11-06 17:11:21.891 Photomania[760:60b] IBAction ScrollView

2014-11-06 17:11:21.892 Photomania[760:60b] IBAction Spiner

2014-11-06 17:11:21.895 Photomania[760:60b] ViewDidLoad!