代码引入xib和sb

• 引入sb

UIStoryboard *sb = [UIStoryboard storyboardWithName:@"home" bundle:nil];
//加载sb默认的vc
UIViewController *vc = [sb instantiateInitialViewController];
//加载sb中指定vc，须要指定vc在sb中的identifier
UIViewController *vc = [sb instantiateViewControllerWithIdentifier:@"vcid"];

• 引入xib

xib文件能够作vc(指定file's owner),或者作view(不指定file's owner)

1. 作vc

//方法1
CustomViewController *vc = [[CustomViewController alloc] initWithNibName:@"xibname" bundle:nil];
//方法2
CustomViewController *vc1 = [[CustomViewController alloc] init];

方法1中的nibname位nil时，系统会去加载名为CustomView的xib，若是没有再去加载名为CustomViewController的xib，仍是没有就返回空。

因此方法2内部就是调用了方法1nibname为nil的状况。

2.作view

//xib里面 须要先绑定view的类
    HaXibView *view = [[NSBundle mainBundle] loadNibNamed:@"XibView" owner:nil options:nil].firstObject;

当xib里面有多个view时，能够指定index来肯定所须要的view

//xib里面 须要先绑定view的累
    HaXibView *view = [[NSBundle mainBundle] loadNibNamed:@"XibView" owner:nil options:nil][1];