如何將多個組件添加到PickerView？

Question

這可能是一個簡單的問題，但如何將多個組件添加到UIPickerView？我使用NSMutableArray來填充一個組件，但我不知道如何填充其他組件。選中某一行時，我還需要更改標籤的值。 在此先感謝 基蘭

Answer 1

我認爲你是一個初學者。以下是如何實現的方法納喬已經正確地指出：

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView { 
    // return the number of components required 
    return 2; 
} 

您可以使用其他NSMutableArray的填充成分。假設你有2個部件，分別使用不同的NSMutableArray即array1和array2：

// Return row count for each of the components 
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component { 
    if (component == 0) { 
     return [array1 count]; 
    } 
    else { 
     return [array2 count]; 
    } 
} 

// Populate the rows of the Picker 
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component { 

    // Component 0 should load the array1 values, Component 1 will have the array2 values 
    if (component == 0) { 
     return [array1 objectAtIndex:row]; 
    } 
    else if (component == 1) { 
     return [array2 objectAtIndex:row]; 
    } 
    return nil; 
} 

使用此代碼來更改label的文字，說selectedValue當PickerView選擇了值：

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component { 
    selectedValue.text = [NSString stringWithFormat: @"%@, %@", [array1 objectAtIndex:[myPicker selectedRowInComponent:0]],[array2 objectAtIndex:[myPicker selectedRowInComponent:1]]]; 
} 

...和你很好去:)

你可能也想看看http://joshhighland.com/blog/2009/09/17/uipickerview-spinning-multiple-components/關於pickerView編程的寶貴提示。

Answer 2

您需要設置數據源，並使用

– numberOfComponentsInPickerView: 
– pickerView:numberOfRowsInComponent: 

設置其委託並使用：

– pickerView:didSelectRow:inComponent: 

更改標籤時一定行中的某種成分被選中。很可能的UITableViewDelegate和數據源

，並採取一看就documentation幫助:)

Answer 3

而不是component我發現使用tag更合適。

然後在代碼：

// returns the # of rows in each component.. 
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{ 
    //NSLog(@"Component_1: %d",pickerView.tag); 
    if (pickerView.tag == 1) 
     return [self.arrOpponentTeams count]; 
    else if (pickerView.tag == 2) 
     return [self.arrMyTeams count]; 
    else 
     return [self.arrPlayers count]; 
} 

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{ 
    //NSLog(@"Component_2: %d",pickerView.tag); 
    if(pickerView.tag == 1) 
     return [self.arrOpponentTeams objectAtIndex:row]; 
    else if (pickerView.tag == 2) 
     return [self.arrMyTeams objectAtIndex:row]; 
    else 
     return [self.arrPlayers objectAtIndex:row]; 
} 

Answer 4

我不知道這是否是有點晚，但我解決了這個法子陣列都有點簡陋，但它可以創造奇蹟你甚至可以把不同顏色以每個陣列

- (void) viewDidLoad { 
    horPickerArray = @[@"00",@"01",@"02",@"03",@"04",@"05".to..24]; 
    minPickerArray = @[@"00",@"01",@"02",@"03",@"04",@"05".to..59]; 
    secPickerArray = @[@"00",@"01",@"02",@"03",@"04",@"05".to..59]; 
} 

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView 
{ 
return 3; 
} 

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component 
{ 
if (component == 0) { 
     return _HorPickerArray.count ; 
    } 
    else if (component == 1) { 
     return _MinPickerArray.count ; 
    } 
    else if (component == 2) { 
     return _SecPickerArray.count ; 
    } 
} 

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component 
{ 
if (component == 0) { 
     return [_HorPickerArray objectAtIndex:row]; 
    } 
    else if (component == 1) { 
     return [_MinPickerArray objectAtIndex:row]; 
    } 
    else if (component == 2) { 
     return [_SecPickerArray objectAtIndex:row]; 
    } 
    return nil; 

} 

而在TextField中

打印

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

    _OficialTime.text =[NSString stringWithFormat: @"%@:%@:%@", [_HorPickerArray objectAtIndex:[_TimerPiker selectedRowInComponent:0]],[_MinPickerArray objectAtIndex:[_TimerPiker selectedRowInComponent:1]], [_SecPickerArray objectAtIndex:[_TimerPiker selectedRowInComponent:2]]]; 
}