我试图检查我将用作URL的字符串是否以http开头.我现在试图检查的方式似乎不起作用.这是我的代码:
NSMutableString *temp = [[NSMutableString alloc] initWithString:@"http://"];
if ([businessWebsite rangeOfString:@"http"].location == NSNotFound){
NSString *temp2 = [[NSString alloc] init];
temp2 = businessWebsite;
[temp appendString:temp2];
businessWebsite = temp2;
NSLog(@"Updated BusinessWebsite is: %@", businessWebsite);
}
[web setBusinessWebsiteUrl:businessWebsite];
有任何想法吗？
我一直在处理一个应用程序,它一直工作正常,直到Xcode下载库或其他东西,然后它开始出现问题.我只是想创建getter/setter方法来从我的APPDelegate中获取几个数组.就像我说它工作正常然后随机出现这个错误现在将不再构建:
property with 'retain(or strong)' attribute must be of object type
这是代码的其余部分:
#import <Foundation/Foundation.h>
#import "Project.h"
#import "TeamMember.h"
@interface Task : NSObject{
NSDate *endDate;
NSDate *startDate;
NSMutableString* notes;
NSMutableString* taskName;
//The error appears first right here over teamMember
TeamMember *teamMember;
Project *project;
}
//The error appears over both of the following lines as well...
@property (nonatomic, retain)TeamMember *teamMember;
@property (nonatomic, retain) Project * project;
@property (nonatomic, retain) NSMutableString *notes;
@property (nonatomic, retain) NSMutableString *taskName;
@property (nonatomic, retain) NSDate *startDate;
@property …我试图弄清楚如何将MKAnnotation的实例添加到MKMapView.我无法弄清楚我做错了什么......一切似乎都没问题,直到我真的尝试将注释添加到mapView.然后我收到SIGABRT错误.这是我的代码:
lon = [[attributeDict objectForKey:@"long"] doubleValue];
lat = [[attributeDict objectForKey:@"lat"] doubleValue];
MKPointAnnotation *point;
CLLocation *theLocation = [[CLLocation alloc]initWithLatitude:lat longitude:lon];
CLLocationCoordinate2D location;
location.latitude = lat;
location.longitude = lon;
[point setCoordinate:(location)];
[point setTitle:businessName];
//ITS RIGHT HERE THAT I GET THE ERROR
[theMap addAnnotation:point];
你必须首先设置地图的区域吗？
嘿,我无法弄清楚我得到的错误.我让我的应用程序工作,然后我不知道我做了什么,但现在不会打开,而是我收到此错误:
Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<TaskViewController 0x16c9b0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key projectToolBar.'
任何想法可能是什么问题？如果我需要,我可以添加我的项目代码......
所以我查看并在界面构建器/故事板中有一个指向projectToolBar的链接,该链接在头文件中没有对应的行.我删除了IB中的问题,但是,现在我收到一个新错误,但它仍然无法正常工作.
*** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<TaskViewController 0x132dd0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key projectView.'
这是我的taskviewController类:
#import <UIKit/UIKit.h>
#import "AppDelegate.h"
#import "newTaskWindow.h"
@interface TaskViewController : UIViewController <DismissPopoverDelegate>{
IBOutlet UIScrollView *taskScrollView;
AppDelegate * _appDelegate;
UIDeviceOrientation orientation;
IBOutlet UIView *newTaskView;
IBOutlet UIBarButtonItem *newTaskButton;
IBOutlet UIBarButtonItem *newTeamMemberButton;
IBOutlet UIBarButtonItem …所以我尝试将参数传递给我的"buttonClicked"函数,以便我可以动态控制单击按钮时发生的情况.我尝试自己做的每一种方式都会破坏我的代码.我在stackOverflow上搜索过很多不同的网站和答案,但我似乎无法找到答案.我对目标C相当新,特别是对于函数,所以我真的可以使用一些帮助来弄清楚如何做到这一点.提前致谢
这是我到目前为止的代码以及我要做的事情:
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
NSLog(@"Hi 1!");
[button addTarget:self action:@selector(buttonClicked:buttonType:buttonID:) forControlEvents:UIControlEventTouchUpInside];
button.frame = CGRectMake(buttonViewXvalue, buttonViewYvalue, buttonViewWidth, buttonViewLength);
[self.view addSubview:button];
然后在头文件中的声明:
- (IBAction)buttonClicked:(id)sender theButtonType: (int)buttonType: theButtonID: (int) buttonID;
和实施:
- (IBAction)buttonClicked:(id)sender theButtonType: (int)buttonType: theButtonID: (int) buttonID
{
//Here I would use the buttonType and buttonID to create a new view.
NSLog(@"Hi!");
}
在我当前的应用程序中,当我单击工具栏按钮时,我正在尝试创建一个菜单屏幕apear.我发现最好的方法是使用UIPopoverController来显示我创建的自定义视图.但是,关于我当前代码的一些内容存在缺陷.当我运行我的应用程序并按下按钮时,我收到一条错误消息,表示当弹出窗口仍然可见时它正在达到dealoc.即使看了几个类似问题的例子,我也不能为我的生活弄清楚如何解决这个问题.这是我的代码:
-(IBAction)newMenu:(id)sender{
newTaskWindow *newTaskWin = [[newTaskWindow alloc]init];
UIView *test = [[UIView alloc]init];
test = newTaskWin.view;
UIPopoverController *taskPop = [[UIPopoverController alloc]initWithContentViewController:newTaskWin];
[taskPop setDelegate:self];
[taskPop presentPopoverFromBarButtonItem:newTaskButton permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
[taskPop setPopoverContentSize:CGSizeMake(400, 500)];
有任何想法吗？提前致谢
}
这是它产生的错误:
*** Terminating app due to uncaught exception 'NSGenericException', reason: '- [UIPopoverController dealloc] reached while popover is still visible.'
*** First throw call stack:
(0x381fb8bf 0x37d471e5 0x381fb7b9 0x381fb7db 0x32065f71 0x37d430c5 0x37d44db7 0x2ecf 0x38155435 0x31cbe9eb 0x31d843cf 0x38155435 0x31cbe9eb 0x31cbe9a7 0x31cbe985 0x31cbe6f5 0x31cbf02d 0x31cbd50f 0x31cbcf01 0x31ca34ed 0x31ca2d2d 0x37f29df3 0x381cf553 0x381cf4f5 0x381ce343 …