使兩個UIPickerView相互關聯

Question

如何在不使用Interface Builder的情況下以編程方式在視圖中設置UIPickerView？當我從第一個UIPickerView，第二個UIPickerView選擇一個值時，也無法理解如何做兩個UIPickerView更改這些值？ 第一個UIPickerView country and seconde UIPickerView城市。

Answer 1

Yes possible you can create array on city within country like 
int select=0; 

(
    india 
     (
     city, 
     ....., 
     ) 
    Australia 
     (
     City, 
     ......, 
    ) 
) 

and use 
picker 

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component 
{ 
    if(picker==1) 
    { 
    return [arr_counry count]; 
    } 
    else if(picker==2) 
    { 
    return [[arr_counry objectAtIndex:select] count]; 
    } 

} 

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component 
{ 
    if(picker==1) 
    { 
    select=[arr_currency objectAtIndex:row]; 
    [picker reloadAllComponents]; 

    } 
    else if(picker==2) 
    { 

    } 
} 

Answer 2

請參考下面的鏈接，

http://gabriel-tips.blogspot.in/2011/04/uipickerview-add-it-programmatically_04.html http://developer.apple.com/library/ios/#documentation/UIKit/Reference/UIPickerView_Class/index.html http://www.edumobile.org/iphone/iphone-programming-tutorials/how-to-implement-pickerview-programmatically-in-iphone/

兩個選擇器視圖，您可以使用標籤值或把它在屬性..