Xcode的帮助？ - “'didRotateFromInterfaceOrientation'未声明”+“预期';'之前'：'令牌'

Question

我想在Xcode中创建一个应用程序，当手机从一个方向旋转到另一个方向时，它将切换到新的视图。

这里是 “switchviewcontroller.h” 文件代码：

#import <UIKit/UIKit.h> 

@interface SwitchViewController : UIViewController { 

} 

-(IBAction)switchview:(id)sender; 

@end 

---

这里是 “switchviewcontroller.m” 文件代码：

---

#import "SwitchViewController.h" 
#import "secondview.h" 

@implementation SwitchViewController 

-(IBAction)switchview:(id)sender 

// Override to allow orientations other than the default portrait orientation. 
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { 
    // Return YES for supported orientations 
    return YES; 
} 

- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation 
{ 
    if((fromInterfaceOrientation == UIInterfaceOrientationLandscapeLeft) || 
     (fromInterfaceOrientation == UIInterfaceOrientationLandscapeRight)) 
    {  
     [[secondview alloc] initWithNibName:@"secondview" bundle:[NSBundle mainBundle]]; 
    } 

} 

我得到的在问题中显示2个错误，所以它不起作用。

Answer 1

您错过了-(IBAction)switchview:(id)sender 的实现块 - 将其设置为-(IBAction)switchview:(id)sender {}，然后重试。