其他按钮标题上的按钮项目的基本IBAction项目

Question

希望这是一个简单的。

以下是处理：我有一个按钮项目，“选择”，打开一个选择器。当用户从选取器中选择一些东西时，“选择”按钮的标题变为选择并且选择器在视野外动画。现在我已经创建了第二个“搜索”按钮来查询Google Places API，但是我需要它不查询ITS标题，因为它现在正在执行，但是标题是OTHER按钮。合理？

这是相关的代码。我是积极的，这是一个简单的调整，但我是Objective-C的新手，所以我仍然围绕着事情的运作方式。

ViewController.m

#import "RendezvousViewController.h" 

@interface RendezvousViewController() 

@end 

@implementation RendezvousViewController 

// returns the number of 'columns' to display. 
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView 
{ 
    return 1; 
} 

// returns the # of rows in each component.. 
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component 
{ 
    return [self.userSelectArray count]; 
} 

-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component 
{ 
    return [self.userSelectArray objectAtIndex:row]; 
} 
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{ 

    NSLog(@"Selected Row %ld", (long)row); 
    switch(row) 
    { 

     case 0: 
      self.userSelection.title = @"Breakfast"; 
      break; 
     case 1: 
      self.userSelection.title = @"Brunch"; 
      break; 
     case 2: 
      self.userSelection.title = @"Lunch"; 
      break; 
     case 3: 
      self.userSelection.title = @"Dinner"; 
      break; 
     case 4: 
      self.userSelection.title = @"Bar"; 
      break; 
     case 5: 
      self.userSelection.title = @"Late Night Snack"; 
      break; 
    } 

} 

-(void)viewDidLoad { 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view, typically from a nib. 
    self.userSelectArray = [[NSArray alloc]   initWithObjects:@"Breakfast",@"Brunch",@"Lunch",@"Dinner",@"Bar",@"Late Night Snack" , nil]; 

    //Make this controller the delegate for the map view. 
    self.mapView.delegate = self; 

    // Ensure that you can view your own location in the map view. 
    [self.mapView setShowsUserLocation:YES]; 

    //Instantiate a location object. 
    locationManager = [[CLLocationManager alloc] init]; 

    //Make this controller the delegate for the location manager. 
    [locationManager setDelegate:self]; 

    //Set some parameters for the location object. 
    [locationManager setDistanceFilter:kCLDistanceFilterNone]; 
    [locationManager setDesiredAccuracy:kCLLocationAccuracyBest]; 
    firstLaunch=YES; 
} 

- (void)didReceiveMemoryWarning 
{ 
    [super didReceiveMemoryWarning]; 
    // Dispose of any resources that can be recreated. 
} 

- (IBAction)toolbarButtonPress:(id)sender { 
    UIBarButtonItem *button = (UIBarButtonItem *)sender; 
    NSString *buttonTitle = [button.title lowercaseString]; 
    [self queryGooglePlaces:buttonTitle]; 
    //Use the above title text to build the URL query and get the data from Google. 
} 

ViewController.m

@interface RendezvousViewController : UIViewController <MKMapViewDelegate, CLLocationManagerDelegate, UIPickerViewDataSource,UIPickerViewDelegate> 

{ 
    CLLocationManager *locationManager; 
    CLLocationCoordinate2D currentCentre; 
    int currenDist; 
    BOOL firstLaunch; 
} 

@property (strong, nonatomic) IBOutlet MKMapView *mapView; 
@property (strong, nonatomic) IBOutlet UIBarButtonItem *userSelection; 
@property (strong, nonatomic) IBOutlet UIBarButtonItem *searchButton; 
@property (strong, nonatomic) IBOutlet UIPickerView *userPicker; 
@property (strong, nonatomic)   NSArray *userSelectArray; 

@end 

和往常一样，在此先感谢。

Answer 1

如果您在视图上将按钮设为属性，您可以直接访问它（而不是使用发件人）。

但是为什么不直接从选取器中直接从按钮标题中获取它？

编辑：

所以根据你的代码，你要添加另一个按钮

@implementation RendezvousViewController{ 
    UIButton *selectButton; 
} 

Initalize它

-(void)viewDidLoad { 
    selectButton = [[UIButton alloc] init]; 
    ... 
} 

然后设置在选择器标题

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{ 

    NSLog(@"Selected Row %ld", (long)row); 
    switch(row) 
    { 
     case 0: 
      self.selectButton.title = @"Breakfast"; 
      break; 
     ... 
    } 
} 

然后抓住它当选择你的其他按钮：

- (IBAction)toolbarButtonPress:(id)sender { 
    NSString *buttonTitle = [self.selectButton.title lowercaseString]; 
    [self queryGooglePlaces:buttonTitle]; 
    //Use the above title text to build the URL query and get the data from Google. 
} 



@implementation RendezvousViewController{ 
    UIButton *selectButton; 
    NSString *selection; 
} 

不过我建议，有另一个属性只是存储选择，而不是依赖于你的用户界面，如按钮标题值。它应该是这样的：

Initalize它

-(void)viewDidLoad { 
    selectButton = [[UIButton alloc] init]; 
    selection = @""; 
    ... 
} 

然后设置标题的选择器

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{ 

    NSLog(@"Selected Row %ld", (long)row); 
    switch(row) 
    { 
     case 0: 
      selection = @"Breakfast"; 


      break; 
     ... 
    } 
    self.selectButton.title = selection; 
} 

然后在选择你的其他按钮抓住它：

- (IBAction)toolbarButtonPress:(id)sender { 
    [self queryGooglePlaces:selection]; 
    //Use the above title text to build the URL query and get the data from Google. 
} 

Answer 2

if([buttonTitle isEqualToString:"Select"]) 
    return; //no searching 
else{ 
    [self queryGooglePlaces:buttonTitle]; 
}