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iOS开发教程之UIView和UIViewController的生命周期详解

时间:2020-12-09 20:13:02 | 栏目:iOS代码 | 点击:

前言

iOS开发中,创建View常见的两种方式一个是纯代码,一个是借助于XIB;创建ViewController常见的也有两种方式一个是纯代码,一个是借助于StoryBoard。

通过交流我发现很多童鞋对这些概念都很模糊,于是通过实验写一篇博客供参考。

重写View的如下方法

@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

重写ViewController的如下方法

@implementation YFViewController

-(void)loadView{
 
 NSLog(@"%s", __func__);
 
 [super loadView];
}

- (void)viewDidLoad {
 [super viewDidLoad];
 // Do any additional setup after loading the view.
 
 NSLog(@"%s", __func__);
 
 self.view.backgroundColor = [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

结论总结

如果控制器是直接通过代码创建出来的,并且调用方法为[[YFViewController alloc]init]创建VC的生命周期为:

-[YFViewController initWithNibName:bundle:]
-[YFViewController init]
-[YFViewController loadView]
-[YFViewController viewDidLoad]
-[YFViewController viewDidAppear:]

如果创建控制器时勾选了XIB,那么调用方法为[[YFViewController alloc]init]创建VC时的生命周期为:

-[YFViewController initWithNibName:bundle:] 
-[YFViewController init]
-[YFViewController loadView]
-[YFViewController viewDidLoad]
-[YFViewController viewDidAppear:]

如果是通过SB创建控制器,那么VC的生命周期为:

-[ViewController initWithCoder:]
-[ViewController awakeFromNib]
-[ViewController loadView]
-[ViewController viewDidLoad]
-[ViewController viewDidAppear:]

如果纯代码创建UIView,调用方式为YFView *yfView = [[YFView alloc]init];那么它的生命周期为:

-[YFView initWithFrame:]
-[YFView init]
-[YFView layoutSubviews]

如果纯代码创建UIView,调用方式为YFView *yfView = [[YFView alloc]initWithFrame:[UIScreen mainScreen].bounds];那么它的生命周期为:

-[YFView initWithFrame:]
-[YFView layoutSubviews]

如果通过XIB创建UIView,调用方式为NSArray *array = [[NSBundle mainBundle]loadNibNamed:@"YFView" owner:nil options:nil];[array lastObject];那么它的生命周期为:

-[YFView initWithCoder:]
-[YFView awakeFromNib]
-[YFView layoutSubviews]

总结

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