initWithCoder 在什么情况下被调用

定义一个新的CustomView继承自UIView，在Xib文件的View里面设置其Custom Class为 CustomView.m 然后 初始化

    CustomView *customView = [[[NSBundle mainBundle] loadNibNamed:@"CustomView" owner:self options:nil] lastObject];

//    CustomView *customView = [CustomView shareCustomView];

    [self.view addSubview:customView];

这样 以下两个函数就被调用了

在UIViewController里面创建的XIB文件不会调用 initWithCoder，但会调用

- (instancetype)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil

初始化时使用：

    CustomViewController *customVC = [[CustomViewController alloc] initWithNibName:@"CustomViewController" bundle:nil];

    CustomViewController *customVC = [[CustomViewController alloc] init];

    [self presentViewController:customVC animated:YES completion:nil];

- (void)awakeFromNib

{

    NSLog(@"CustomView44444444");

}

- (instancetype)initWithCoder:(NSCoder *)aDecoder

{

    self = [super initWithCoder:aDecoder];

    if (self) {

        NSLog(@"CustomView");

    }

    return self;

}