我正在尝试创建一个简单的测验应用程序(我是初学者),当我启动应用程序时,我想要一个UILabel来显示第一个问题(一系列问题).我在设置初始值时遇到了一些麻烦.
我做了几次尝试,成功了.我的QuizAppDelegate.h文件我声明我的UILabel是这样的:
IBOutlet UILabel * questionField;
在我的主.m文件中,我尝试了以下内容:
- (id)init {
[super init];
questions = [[NSMutableArray alloc] init];
// Not working
questionField = [[UILabel alloc] init];
[questionField setText:@"Hello"];
// Working
NSLog(@"Hello");
[self defaultQuestions];
// [self showQuestion];
return self;
}
我尝试过的另一件事是QuizAppDelegate中的以下内容:
@property (nonatomic, retain) IBOutlet UILabel *questionField;
- (void)changeTitle:(NSString *)toName;
在.m文件中:
@synthesize questionField;
- (id)init {
[super init];
questions = [[NSMutableArray alloc] init];
// Not working
[self changeTitle:@"Hello"];
// Working
NSLog(@"Hello");
[self defaultQuestions];
// [self showQuestion];
return self;
}
-(void)changeTitle:(NSString *)toName { …我正在开发我的第一个Mac应用程序,我在使用NSView及其委托方法时遇到了一些麻烦.我有一个应该响应鼠标事件的NSViewController,即mouseDown.这不起作用,而是我创建了一个自定义的NSView子类,如下所示:
// Delegate method
@protocol CanvasViewDelegate
- (void)mouseDown:(NSEvent *)event;
@end
@interface CanvasView : NSView
{
id delegate;
}
@property (nonatomic, strong) id delegate;
@end
@implementation CanvasView
@synthesize delegate;
- (void)mouseDown:(NSEvent *)event
{
[delegate mouseDown:event];
}
应该充当NSView委托的NSViewController相关部分如下所示:
#import "CanvasView.h"
@interface PaintViewController : NSViewController <CanvasViewDelegate>
{
CanvasView *canvasView;
}
@property (strong) IBOutlet CanvasView *canvasView;
@end
@synthesize canvasView;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Initialization code here.
canvasView = [[CanvasView alloc] init];
canvasView.delegate = …我有一个看起来像这样的podfile:
platform :ios, '6.0'
xcodeproj 'NetApp.xcodeproj'
pod 'AFNetworking'
pod 'TTTAttributedLabel'
pod '[x]'
决定免去pod '[x]'从我podfile,我然后跑pod install和pod update.但现在我收到以下警告:
SystemConfiguration framework not found in project, or not included in precompiled header. Network reachability functionality will not be available.
MobileCoreServices framework not found in project, or not included in precompiled header. Automatic MIME type detection when uploading files in multipart requests will not be available.
我试图在Pods和my中手动添加框架Xcode-projplace.但它似乎不起作用,并且缺少一些功能.
我该如何解决这个问题？是否有可能以某种方式重新安装所有pod？
更新
似乎并不是因为删除了导致它的Pod.做了一个git revert.但当我跑 pod update(更新AFNetworking …
我正在开发一个Rails应用程序,其中我有一个Session控制器,其中包含以下方法:
def destroy
session[:user_id] = nil
redirect_to root_path, notice: "Utloggad"
end
在我的路线文件中,我有以下路线:
controller :session do
get 'login' => :new
post 'login' => :create
delete 'logout' => :destroy
end
我的观点看起来像这样:
= link_to "Log out", logout_path, method: :delete, :class => "small"
当我按下链接时,我收到以下错误:uninitialized constant SessionController.我怎么解决这个问题？
我有一个包含两个模型的Rails应用程序,Post并且User,我正在使用Sphinx和thinking-sphinxgem来启用搜索.每个帖子属于一个用户,belongs_to每个帖子都有很多帖子.当我搜索帖子时,我也希望能够通过创建帖子的用户名进行搜索.我的帖子索引如下:
ThinkingSphinx::Index.define :post, :with => :active_record do
indexes name, :sortable => true
indexes post_description
indexes user.name, as: :post_user
has user_id, team_id, created_at, updated_at
end
我的用户索引如下所示:
ThinkingSphinx::Index.define :user, :with => :active_record do
indexes name, :sortable => true
indexes email
indexes about
has team_id, created_at, updated_at
end
当我运行:rake ts:index,我收到以下错误:
rake aborted!
NoMethodError: undefined method `_reflect_on_association' for #<Class:0x007fd417610c90>
关于如何解决它的任何想法？
更新
indexes user.name, as: :post_user当我没有任何错误时,我很确定这条线是导致他的.但该协会仍然无效..