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。
重写UIView的方法如下：
@implementation CustomView
-(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
结论总结
- 如果纯代码创建UIView，调用方式为CustomView *view = [[CustomView alloc]init]；那么它的生命周期为：
-[CustomView initWithFrame:]
-[CustomView init]
-[CustomView layoutSubviews]
- 如果纯代码创建UIView，调用方式为CustomView *view = [[CustomView alloc]initWithFrame:[UIScreen mainScreen].bounds]；那么它的生命周期为：
-[CustomView initWithFrame:]
-[CustomView layoutSubviews]
- 如果通过XIB创建UIView，调用方式为NSArray *array = [[NSBundle mainBundle]loadNibNamed:@"CustomView" owner:nil options:nil];[array lastObject];那么它的生命周期为：
-[CustomView initWithCoder:]
-[CustomView awakeFromNib]
-[CustomView layoutSubviews]
重写ViewController的如下方法:
@implementation CustomViewController
-(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[[CustomViewController alloc]init]创建VC的生命周期为：
-[CustomViewController initWithNibName:bundle:]
-[CustomViewController init]
-[CustomViewController loadView]
-[CustomViewController viewDidLoad]
-[CustomViewController viewDidAppear:]
- 如果创建控制器时勾选了XIB，那么调用方法为[[CustomViewController alloc]init]创建VC时的生命周期为：
-[CustomViewController initWithNibName:bundle:]
-[CustomViewController init]
-[CustomViewController loadView]
-[CustomViewController viewDidLoad]
-[CustomViewController viewDidAppear:]
- 如果是通过Nib创建控制器，那么VC的生命周期为：
-[ViewController initWithCoder:]
-[ViewController awakeFromNib]
-[ViewController loadView]
-[ViewController viewDidLoad]
-[ViewController viewDidAppear:]
