iOS ViewController的生命周期

#import "ViewController.h"
 
@interface ViewController ()
@property (nonatomic, strong) NSArray *array;
@end
 
@implementation ViewController
 
 
/**
 *  view加载完毕调用
 */
- (void)viewDidLoad
{
    [super viewDidLoad];
}
 
/**
 *  view即将显示到window上调用
 */
- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
}
 
/**
 *  view显示完毕调用(已经显示到窗口上)
 */
- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
}
 
/**
 *  view即将从window上移除(即将看不见)
 */
- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
}
 
/**
 *  view从window上完全移除(完全看不见)
 */
- (void)viewDidDisappear:(BOOL)animated
{
    [super viewDidDisappear:animated];
}
 
/**
 *  view即将销毁的时候调用
 */
- (void)viewWillUnload
{
    [super viewWillUnload];
}
 
/**
 *  view销毁完毕的时候调用
 */
- (void)viewDidUnload
{
    [super viewDidUnload];
     
    // 移除数据
    self.array = nil;

}
 
/**
 *  当接收到内存警告的时候
 */
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
 
}
 
@end

执行顺序就是上面代码的顺序，从上往下

loadView --> viewDidLoad --> viewWillAppear --> viewDidAppear --> viewWillDisappear --> viewDidDisappear --> viewWillUnload --> viewDidUnload