代碼引入xib和sb

• 引入sb

UIStoryboard *sb = [UIStoryboard storyboardWithName:@"home" bundle:nil];
//加載sb默認的vc
UIViewController *vc = [sb instantiateInitialViewController];
//加載sb中指定vc，須要指定vc在sb中的identifier
UIViewController *vc = [sb instantiateViewControllerWithIdentifier:@"vcid"];

• 引入xib

xib文件能夠作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時，系統會去加載名爲CustomView的xib，若是沒有再去加載名爲CustomViewController的xib，仍是沒有就返回空。

因此方法2內部就是調用了方法1nibname爲nil的狀況。

2.作view

//xib裏面 須要先綁定view的類
    HaXibView *view = [[NSBundle mainBundle] loadNibNamed:@"XibView" owner:nil options:nil].firstObject;

當xib裏面有多個view時，能夠指定index來肯定所須要的view

//xib裏面 須要先綁定view的累
    HaXibView *view = [[NSBundle mainBundle] loadNibNamed:@"XibView" owner:nil options:nil][1];