哪个更快？
@interface ViewController : UIViewController
{
UIView *myView;
}
@end
@implementation ViewController
- (void)myInit(){
UIView *view = [[UIView alloc]init];
myView = view;
view.tag = 1;
}
- (void)viewDidLoad(){
[self myInit];
[self.view addSubview:myView];//accessing by variable
//OR
[self.view addSubView:[self.view viewWithTag:1];//accessing by tag
}
@end
在一个你有一个直接的指针访问，在另一个你需要调用一个方法，然后找到索引对象并返回它以获得相同的对象。我想你有你的答案
It's useful to retrieve elements using "viewWithTag" if the elements were hooked to the cell programmatically (i.e. not defined in a NIB and hooked-up via IBOutlets)—this prevents multiple labels etc. to be created for each instance of the cell.Definitely using a variable and /or IBOUtlet in NIBS has the upper merit more ever because when we want to fetch a view via viewWithTag ,the compiler runs a for loop within its subViews and fetch the first view it finds with the given tag.Hence in case where you have two view with same tag ,using viewWithTag always have a major disadvantage.