UINavigation 控制器 UIViewController 和 UItoolbar 作为子视图问题答案

【问题标题】：UINavigation controller UIViewController and UItoolbar as a subview issueUINavigation 控制器 UIViewController 和 UItoolbar 作为子视图问题
【发布时间】：2011-08-26 17:57:05
【问题描述】：

大家好，我正试图离开增强现实并转到我的导航控制器的下一个视图控制器

代码来自 ARKit 演示，我刚刚以编程方式添加了一个 UIToolbar 作为具有操作按钮的子视图。我希望这个按钮指向我现有导航控制器的下一个视图控制器。动作 takePicture: 被执行，因为我有一个 NSLog 消息但没有添加新的视图控制器

这是 ARGeoViewController.h 的代码

#import <Foundation/Foundation.h>

#import "ARViewController.h"
#import "AfterARViewController.h"


@interface ARGeoViewController : ARViewController {
CLLocation *centerLocation;
AfterARViewController *afterARViewController;

}

@property (nonatomic, retain) CLLocation *centerLocation;
- (IBAction)takePicture:(id)sender;
@property (nonatomic, retain) AfterARViewController *afterARViewController;

@end

这是 ARGeoViewController.m 的代码

#import "ARGeoViewController.h"

#import "ARGeoCoordinate.h"
#import "ARViewController.h"

@implementation ARGeoViewController

@synthesize centerLocation;

@synthesize afterARViewController;


- (void)setCenterLocation:(CLLocation *)newLocation {
[centerLocation release];
centerLocation = [newLocation retain];

for (ARGeoCoordinate *geoLocation in self.coordinates) {
    if ([geoLocation isKindOfClass:[ARGeoCoordinate class]]) {
        [geoLocation calibrateUsingOrigin:centerLocation];

        if (geoLocation.radialDistance > self.maximumScaleDistance) {
            self.maximumScaleDistance = geoLocation.radialDistance;
        }
    }
}

 }
   -(void)viewWillAppear:(BOOL)animated{

UIToolbar *toolbar = [UIToolbar new];
toolbar.barStyle = UIBarStyleBlackTranslucent;


// create a bordered style button with custom title
UIBarButtonItem *playItem = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCamera
                                                                           target:self
                                                                           action:@selector(takePicture:)] autorelease];


NSArray *items = [NSArray arrayWithObjects: 
                  playItem,
                  nil];
toolbar.items = items;

// size up the toolbar and set its frame
// please not that it will work only for views without Navigation toolbars. 
[toolbar sizeToFit];
CGFloat toolbarHeight = [toolbar frame].size.height;
CGRect mainViewBounds = self.view.bounds;
[toolbar setFrame:CGRectMake(CGRectGetMinX(mainViewBounds),
                             CGRectGetMinY(mainViewBounds) + CGRectGetHeight(mainViewBounds) - (toolbarHeight),
                             CGRectGetWidth(mainViewBounds),
                             toolbarHeight)];

[self.view addSubview:toolbar];


}

 - (IBAction)takePicture:(id)sender
 {
NSLog(@"takepicture");
if(self.afterARViewController == nil)
{
    AfterARViewController *afterARController = [[AfterARViewController alloc]
                                                    initWithNibName:@"AfterARViewController" bundle:[NSBundle mainBundle]];
    self.afterARViewController = afterARController;
    [afterARController release];
    [cameraController release];


}

[self.navigationController pushViewController:self.afterARViewController  animated:YES];

    }


  @end

非常感谢

【问题讨论】：

标签： iphone uinavigationcontroller subview uitoolbar

【解决方案1】：

我对 ARKit 没有经验，但是 cameraController 是导航控制器堆栈的一部分吗？当你这样做时释放它，你可能会把事情扔掉。作为测试，尝试注释掉释放 cameraController 的代码行，看看它是否会影响这一点。

另外，FWIW 我希望您用来设置工具栏的代码位于 viewDidLoad 中，而不是 viewDidAppear 中。

【讨论】：