UIPickerView運行時錯誤無法識別的選擇發送到實例

Question

我想在我的應用程序的導航欄中的一個Popover視圖裏面放一個UIPickerView。當我點擊按鈕，將打開酥料餅我得到以下錯誤：

-[PopoverView pickerView:numberOfRowsInComponent:]: unrecognized selector sent to instance 0x75577f0 
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[PopoverView pickerView:numberOfRowsInComponent:]: unrecognized selector sent to instance 0x75577f0' 

這是我在我的.h文件：

#import <UIKit/UIKit.h> 

@interface PopoverView : UIViewController { 
    IBOutlet UIPickerView *pickerView; 
    NSMutableArray *pickerArray; 
} 

@end 

這是我爲我的.m文件：

#import "PopoverView.h" 

@interface PopoverView() 

@end 

@implementation PopoverView 

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil 
{ 
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; 
    if (self) { 
     // Custom initialization 
    } 
    return self; 
} 

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view from its nib. 

    // initalizes and allocates the array that holds the values for the picker 
    pickerArray = [[NSMutableArray alloc] init]; 

    //adds the values to the array 
    [pickerArray addObject:@"Blue"]; 
    [pickerArray addObject:@"Green"]; 
    [pickerArray addObject:@"Orange"]; 
    [pickerArray addObject:@"Pink"]; 
    [pickerArray addObject:@"Purple"]; 
    [pickerArray addObject:@"Red"]; 

    [pickerView selectRow:0 inComponent:0 animated:NO]; 
} 

- (NSInteger)numberOfComponentsInPickerView:(NSInteger)component { 

    return 1; 

} 

-(NSInteger)pickerView:(UIPickerView *)picker numberofRowsInComponent:(NSInteger)component{ 

    return [pickerArray count]; 

} 

- (NSString *)pickerView:(UIPickerView *)picker titleForRow:(NSInteger)row forComponent:(NSInteger)component{ 

    return [pickerArray objectAtIndex:row]; 

} 

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

@end 

這會的事實，我想創建我的PopoverView類，而不是包含該按鈕動作的代碼的類中選取器和陣列引起的？

Answer 1

您的

-(NSInteger)pickerView:(UIPickerView *)picker numberofRowsInComponent:(NSInteger)componen 
              HERE ---^ 

方法的錯字。它應該是numberOfRowsInComponent，大寫字母「O」。