warning 生命周期的方法调用顺序是从1到10
// 1
- (instancetype)init
{
self = [super init];
if (self) {
NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
}
return self;
}
// 2
- (void)loadView
{
[super loadView];
NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
}
// 3
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
}
// 4
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
}
// 5
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
}
// 6
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
}
// 7
- (void)viewDidDisappear:(BOOL)animated
{
[super viewDidDisappear:animated];
}
// 8
- (void)viewWillUnload
{
[super viewWillUnload];
NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
}
// 9
- (void)viewDidUnload
{
[super viewDidUnload];
NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
}
// 10
- (void)dealloc
{
NSLog(@"%s, line = %d", __FUNCTION__, __LINE__);
}
initialize和load的区别
Apple的文档很清楚地说明了initialize和load的区别在于：load是只要类所在文件被引用就会被调用，而initialize是在类或者其子类的第一个方法被调用前调用。所以如果类没有被引用进项目，就不会有load调用；但即使类文件被引用进来，但是没有使用，那么initialize也不会被调用。
ViewController生命周期
