我正在使用带有三个组件的UIpicker。我希望如果我根据所选组件在第一个组件中选择一行,它将显示第二个组件中相应数据的值。 我使用数组的第一个组件的值,如@“UK”,@“US”,@“EU”。现在我想如果用户在第一个组件中选择英国,那么我想加载UKsize1 = [NSArray arrayWithObjects:@“1 “,@”2“,@”3“,@”4“,@”5“,零];在第二个组件中,如果用户在第一个组件中选择了US,那么我想在第二个组件中加载EUsize2=[NSArray arrayWithObjects:@"11",@"22",@"33",@"44",@"55", nil];
。相同的欧盟值,然后我想加载USsize3=[NSArray arrayWithObjects:@"111",@"222",@"333",@"444",@"555", nil];
。我希望第二个分量值根据第一个分量改变,第三个分量值是固定的。如何根据UIPickerview中的第一个组件选择来设置第二个组件中的数据
这段代码我试过但我没有得到确切的价值。
- (id)init
{
if (self = [super init]) {
notesToDisplayForKey = [NSArray arrayWithObjects: @"UK", @"US", @"EU", nil];
scaleNames = [NSArray arrayWithObjects: @"11", @"22", @"33", @"555",@"666",@"777",nil];
scaleValue=[NSArray arrayWithObjects: @"1" ,@"2", @"3", @"4",@"5",@"6", @"7",@"8",@"9", @"10",@"11",nil];
UKsize1=[NSArray arrayWithObjects:@"1",@"2",@"3",@"4",@"5", nil];
EUsize2=[NSArray arrayWithObjects:@"11",@"22",@"33",@"44",@"55", nil];
USsize3=[NSArray arrayWithObjects:@"111",@"222",@"333",@"444",@"555", nil];
}
return self;
}
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
return 3;
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
// Returns
switch (component) {
case 0: return [notesToDisplayForKey count];
case 1:
if([selectedKey isEqualToString:@"UK" ])
{
return [UKsize1 count];
}
else if([selectedKey isEqualToString:@"US"])
{
return [USsize3 count];
}
else
{
return [EUsize2 count];
}
//return [scaleNames count];
case 2: return [scaleValue count];
default:break;
}
return 0;
}
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
switch (component) {
case 0: return [notesToDisplayForKey objectAtIndex:row];
case 1:if([selectedKey isEqualToString:@"UK" ])
{
selectedScale = [scaleNames objectAtIndex:row];
return selectedScale;
}
else if([selectedKey isEqualToString:@"US"])
{
selectedScale = [USsize3 objectAtIndex:row];
return selectedScale;
}
else
{
selectedScale = [EUsize2 objectAtIndex:row];
return selectedScale;
}
case 2: return [scaleValue objectAtIndex:row];
default:break;
}
return nil;
}
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
// NSLog(@"Row %i selected in component %i", row, component);
switch (component) {
case 0:
selectedKey = [notesToDisplayForKey objectAtIndex:row];
return;
case 1:
// selectedScale = [scaleNames objectAtIndex:row];
if([selectedKey isEqualToString:@"UK" ])
{
selectedScale = [scaleNames objectAtIndex:row];
return;
}
else if([selectedKey isEqualToString:@"US"])
{
selectedScale = [USsize3 objectAtIndex:row];
return;
}
else
{
selectedScale = [EUsize2 objectAtIndex:row];
return;
}
return;
case 2:
selectedValue = [scaleValue objectAtIndex:row];
return;
default:break;
}
}
什么问题?当你选择欧盟时,你不想要11,22,33 ...阵列吗?这些是EUsize2阵列的价值。 – rdelmar
我想要如果欧盟11,22,33,如果英国那么UKsize1阵列价值会来。 @rdelmar – Sport