ios - self.revealViewController.panGestureRecognizer 在 iOS SWRevealViewController 中显示为空

Question

我不想在我的应用程序中使用 SWRevealViewController，因为我按照给定链接“https://www.youtube.com/watch?v=5SUV1YY2yxQ”中的步骤进行操作。

但是我的应用程序在这一行崩溃了

[self.view addGestureRecognizer:self.revealViewController.panGestureRecognizer];

编译器显示以下错误

terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSArrayM insertObject:atIndex:]: object cannot be nil'.

请检查我的 Storyboard设计

下面是我的蓝色背景 View 代码，我想在其中打开显示 View Controller .h 文件

#import <UIKit/UIKit.h>
 #import "SWRevealViewController.h"

@interface DashboardSixOptionViewController : UIViewController 
{

    SWRevealViewController *revealViewController;

}

@property (nonatomic,retain) SWRevealViewController *revealViewController;
@end

.m文件

@interface DashboardSixOptionViewController ()

@end

@implementation DashboardSixOptionViewController
@synthesize revealViewController = _revealViewController;
- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    NSLog(@"gesture desc::%@",self.revealViewController.panGestureRecognizer);


    [self.view addGestureRecognizer:self.revealViewController.panGestureRecognizer];
}
-(void)configureView
{
 [self.navigationController.navigationBar setTintColor:[UIColor orangeColor]];

    CGRect dashboardNavFrame = self.navigationController.navigationBar.bounds;
//    dashboardNavFrame.size.height += 5;

    self.toolBar = [[UIToolbar alloc] initWithFrame:dashboardNavFrame];

    [self.toolBar setAutoresizingMask:UIViewAutoresizingFlexibleWidth];

    [self.toolBar setTintColor:[UIColor redColor]];


    //disable any back btn
    self.toolBar.clearsContextBeforeDrawing = NO;
    self.toolBar.clipsToBounds = NO;
    [self.toolBar setTag:700];

    NSMutableArray *buttons = [[NSMutableArray alloc] init];


    UIImage *imgOption;

    imgOption = [UIImage imageNamed:@"imgOptionsIOS7.png"];

    UIButton *aOptionButton = [UIButton buttonWithType:UIButtonTypeCustom];
//    [aOptionButton setEnabled:NO];
    aOptionButton.frame = CGRectMake(0, 0, imgOption.size.width, imgOption.size.height);
    [aOptionButton setImage:imgOption forState:UIControlStateNormal];
//    [aOptionButton addTarget:self action:@selector(showLeftMenu:) forControlEvents:UIControlEventTouchUpInside];
    [aOptionButton addTarget:self.revealViewController action:@selector(revealToggle:) forControlEvents:UIControlEventTouchUpInside];


    UIBarButtonItem *btn = [[UIBarButtonItem alloc] initWithCustomView:aOptionButton];
    [btn setTarget:self.revealViewController];
    [btn setAction:@selector(revealToggle:)];
    [buttons addObject:btn];
  [self.toolBar setItems:buttons animated:YES];

    [self.navigationController.navigationBar addSubview:self.toolBar];

}

从 View Controller DashboardSixOptionView View 以编程方式推送下面是我的代码

DashboardSixOptionView  = [mainStoryboard instantiateViewControllerWithIdentifier:@"DashboardStoryBoardWithSixOption"];
    DashboardSixOptionView.arrTableViewHreaders = self.arrForMenuOption;
    [self.navigationController pushViewController:DashboardSixOptionView animated:YES];

请帮我弄清楚为什么我会崩溃。

提前致谢朴雅卡

Answer 1

我猜 self.revealViewController.panGestureRecognizer 是 nil，因为您为 SWRevealViewController 创建了一个属性，但没有在 viewDidLoad 中分配任何值。

您是否在 Storyboard 中正确设置了所有类？

另外，为什么要为 SWRevealViewController 使用 @synthesize 和类变量？没有必要再这样做了。

我建议你看看this great tutorial用于 SWRevealViewController。