iOS-關於頁面跳轉時全局變量賦值不到的問題

一般我們開發的時候都會設置一個基類的UIViewController,博主設置了一個BaseViewController基類

#import "BaseViewController.h"

@interface BaseViewController ()

@end

@implementation BaseViewController

- (id)init{
    if (self == [super init]) {
        self.view.backgroundColor = [UIColor redColor];
    }
    return self;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

然後設置兩個界面ViewControllView 和SectionViewControllver繼承自BaseViewControllver;

#import "BaseViewController.h"

@interface ViewController : BaseViewController


@end

#import "BaseViewController.h"
@interface SectionViewController : BaseViewController
@property (nonatomic,copy) NSString *show;
@end

其中SectionViewController有一個show 的屬性,此時我們發送一個事件讓頁面1跳轉到頁面2，並設頁面2的show有值

- (void)showssClick{
    SectionViewController *secVC = [[SectionViewController alloc] init];
    secVC.show = @"我跳啦";
    [self.navigationController pushViewController:secVC animated:YES];
}

但是跳轉到頁面二時,在ViewDidLoad顯示是爲空

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

2015-10-11 00:14:32.291 HelloWorldSW[2294:97355] (null)

樓主感覺各個邏輯都沒有錯，但是爲什麼後面就是沒值呢，而且基類只是在init上設置了一個self.view的背景色

後面樓主去掉了這個背景色，改在基類的ViewDidLoad實現，頁面二的show就有值了

#import "BaseViewController.h"

@interface BaseViewController ()

@end

@implementation BaseViewController

- (id)init{
    if (self == [super init]) {
        
    }
    return self;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    self.view.backgroundColor = [UIColor redColor];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}