cocoa-touch - 切换旋转 View 时，iOS 应用程序在打开时崩溃

Question

我正在尝试在 XCode 中开发一个应用程序，该应用程序将在旋转时切换到新 View 。

这是 view1controller.h 的代码:

#import UIKit/UIKit.h

@interface TestViewController : UIViewController {}

IBOutlet UIView *portrait;
IBOutlet UIView *landscape;

@property(nonatomic,retain) UIView *portrait;
@property(nonatomic,retain) UIView *landscape;

@end

这里是 view1controller.m 的代码:

#import "view1controller.h"

@implementation TestViewController

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation 
{
    if(((interfaceOrientation == UIInterfaceOrientationLandscapeLeft) || (interfaceOrientation == UIInterfaceOrientationLandscapeRight)))
    {
        self.view = landscape;  
    } else if (((interfaceOrientation == UIInterfaceOrientationPortrait) || (interfaceOrientation == UIInterfaceOrientationPortraitUpsideDown))) {
        self.view = portrait;
    }

    return YES;
}

- (void)didReceiveMemoryWarning {
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc that aren't in use.
}

- (void)viewDidUnload {
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

- (void)dealloc {
    [super dealloc];
}

@synthesize portrait,landscape;

@end

无论如何，应用程序打开但在打开时崩溃。

Answer 1

尝试这样的事情:

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation 
{
    if(interfaceOrientation == UIInterfaceOrientationLandscapeLeft)
    {
        self.view = landscapeleft;  
    } 

    if (interfaceOrientation == UIInterfaceOrientationPortrait) 
    {
        self.view = portrait;
    }

    if (interfaceOrientation == UIInterfaceOrientationPortraitUpsideDown)
    {
        self.view = portraitupsidedown;
    }

    if (interfaceOrientation == UIInterfaceOrientationLandscapeRight)
    {
        self.view = landscapeleft;
    }


    return YES;
}