Question

我正在尝试使用iOS构建应用程序。我正在使用Xcode 6.4，the tutorial I was following似乎接受使用fun和override，但是当我尝试它时，它会带来错误。我正在将受保护的页面连接到我的注册页面。

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

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

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

    - (void)ViewDidAppear(animated: bool) {
        [self.PerformSegueWithIdentifier("LoginView", sender: self)];
    }

}

@end

有人可以帮我指出我的错误和解决方案吗？

Answer 1

欢迎来到SO。通常这不是一般的调试服务，但你可能想要一脚......

在Objective-C方法中，不能在其他方法中声明。他们可以在Swift
Swift代码不能与Objective-C代码一起消失。
案例在Swift和Obj-C中很重要，因此PerformSegueWithIdentifier与performSegueWithIdentifier

所以你要做的正确版本是......

@interface ViewController ()

@end

@implementation ViewController

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

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

}

- (void)viewDidAppear:(BOOL)animated {
    [self performSegueWithIdentifier:@"LoginView" sender:self];
}

@end

玩得开心，享受iOS开发。

Answer 2

您无法在另一个方法定义中插入

在我看来，你在某种程度上搞砸了Swift和Objective C代码，您的代码应如下所示：

@interface ViewController ()

@end

@implementation ViewController

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

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


}

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated]; 

    [self performSegueWithIdentifier:@"LoginView" sender:self];
}

@end

Answer 3

看起来你只是试图覆盖viewcontrollers viewDidAppear方法。如果是这种情况，那么该方法位于错误的位置（在您的代码中，它的嵌套在didReceiveMemoryWarning中

试试这个：

@interface ViewController ()

@end

@implementation ViewController

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

- (void)viewDidAppear:(BOOL) animated {
    [super viewDidAppear:animated];
    [self.performSegueWithIdentifier("nameOfSeque", sender: self)];
}

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

@end

使第一个iOS应用程序工作

3 个答案: