Preface
In iOS development, there are two common ways to create Views: pure code, and one is with the help of XIB; there are two common ways to create ViewController: pure code, and the other is with the help of StoryBoard.
Through communication, I found that many children's shoes are very vague about these concepts, so I wrote a blog for reference through experiments.
The following method of rewriting the View
@implementation YFView
-(instancetype)init{
self = [super init];
NSLog(@"%s", __func__);
return self;
}
-(instancetype)initWithFrame:(CGRect)frame{
self = [super initWithFrame:(CGRect)frame];
NSLog(@"%s", __func__);
return self;
}
-(instancetype)initWithCoder:(NSCoder *)aDecoder{
self = [super initWithCoder:aDecoder];
NSLog(@"%s", __func__);
return self;
}
-(void)awakeFromNib{
[super awakeFromNib];
NSLog(@"%s", __func__);
}
-(void)layoutSubviews{
NSLog(@"%s", __func__);
}
@end
The following method of rewriting ViewController
@implementation YFViewController
-(void)loadView{
NSLog(@"%s", __func__);
[super loadView];
}
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
NSLog(@"%s", __func__);
= [UIColor redColor];
}
-(void)viewDidAppear:(BOOL)animated{
NSLog(@"%s", __func__);
[super viewDidAppear:animated];
}
-(instancetype)init{
self = [super init];
NSLog(@"%s", __func__);
return self;
}
-(instancetype)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{
self = [super initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil];
NSLog(@"%s", __func__);
return self;
}
-(instancetype)initWithCoder:(NSCoder *)aDecoder{
self = [super initWithCoder:aDecoder];
NSLog(@"%s", __func__);
return self;
}
-(void)awakeFromNib{
NSLog(@"%s", __func__);
[super awakeFromNib];
}
@end
Conclusion summary
If the controller is created directly through the code and the call method is[[YFViewController alloc]init]The life cycle of creating a VC is:
-[YFViewController initWithNibName:bundle:] -[YFViewController init] -[YFViewController loadView] -[YFViewController viewDidLoad] -[YFViewController viewDidAppear:]
If XIB is checked when creating the controller, the call method is[[YFViewController alloc]init]The life cycle when creating a VC is:
-[YFViewController initWithNibName:bundle:] -[YFViewController init] -[YFViewController loadView] -[YFViewController viewDidLoad] -[YFViewController viewDidAppear:]
If the controller is created through SB, the life cycle of the VC is:
-[ViewController initWithCoder:] -[ViewController awakeFromNib] -[ViewController loadView] -[ViewController viewDidLoad] -[ViewController viewDidAppear:]
If pure code creates a UIView, the call method isYFView *yfView = [[YFView alloc]init];Then its life cycle is:
-[YFView initWithFrame:] -[YFView init] -[YFView layoutSubviews]
If pure code creates a UIView, the call method isYFView *yfView = [[YFView alloc]initWithFrame:[UIScreen mainScreen].bounds];Then its life cycle is:
-[YFView initWithFrame:] -[YFView layoutSubviews]
If you create a UIView through XIB, the call method isNSArray *array = [[NSBundle mainBundle]loadNibNamed:@"YFView" owner:nil options:nil];[array lastObject];Then its life cycle is:
-[YFView initWithCoder:] -[YFView awakeFromNib] -[YFView layoutSubviews]
Summarize
The above is the entire content of this article. I hope that the content of this article has a certain reference value for everyone's study or work. If you have any questions, you can leave a message to communicate. Thank you for your support.