我为第一个 UIPickerView 编写了这段代码
- (void)viewDidLoad
NSURL *url = [NSURL URLWithString:
@"http://localhost:8080/Data/resources/converter.country/"];
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
[request setDelegate:self];
[request startAsynchronous];
// countrys = [[UIPickerView alloc] init];
countrys.delegate = self;
countrys.dataSource = self;
countrys.showsSelectionIndicator = YES;
countryField.inputView=countrys;
- (NSString*)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
NSString *codeCity;
codeCity=[countriesArray objectAtIndex:row];
return codeCity;
}
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
return 1;
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
return [countriesCodeArray count];
}
然后我想用城市制作另一个 UIPickerView 。我写了这个
citys.delegate = self;
citys.dataSource = self;
citys.showsSelectionIndicator = YES;
cityField.inputView=citys;
但是当我点击它时我有国家列表。我应该如何更改数据源？以及如何使用 UIPickerView 的默认功能，例如 numberOfComponentsInPickerView 、 numberOfRowsInComponent: ... 与第二个 UIPickerView ？
您可以将标签分配给选择器视图，然后可以在数据源/委托方法中检查这些标签
citysPickerview.tag = 2
otherPickerview.tag = 1
// then you can check for these tags in pickerview datasource/delegate methods like this -
- (NSString*)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
NSString *title;
if (pickerview.tag == 1) // this is otherPickerview
{
title=[countriesArray objectAtIndex:row]; // your logic to get title for otherpickerview
}
else if (pickerview.tag == 2) // this is citysPickerview
{
title=[countriesArray objectAtIndex:row]; // your logic to get title for cityspickerview
}
return title;
}
您应该在所有数据源/委托代码中遵循相同的机制:)
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