objective-c - ios导航错误使用按钮

Question

我正在尝试从登录屏幕转到注册。但是出现错误...

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Application tried to present a nil modal view controller on target .'

登录.H

#import "SignupController.h"

@interface LoginController : UIViewController {

IBOutlet SignupController *signupController;

登录.M

(IBAction)signup:(UIButton*) sender
{
    NSLog(@"lla"); 
        [self presentModalViewController:signupController animated:YES];

}

Answer 1

您需要先分配并启动您的注册 Controller 。

self.signupController = [[SignupController alloc]initWithNibName:xibname];
[self presentModalViewController:signupController animated:YES];

其中 xibname is 将是您的 nibfile 的名称，类似于 @"signupController"
如果你的接口(interface)文件被称为 signupController.xib
塞巴斯蒂安