iOS5 中的 UIPickerView Outlet 出现问题？

发布于 2024-12-22 18:51:58 字数 130 浏览 2 评论 0原文

我不明白应该连接哪些插座！在商店我有：

dataSource delegate

但是我应该在哪里连接它们呢？然后我该如何使用它们？

???

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伊面 2024-12-29 18:51:58

在 Xcode 中，连接数据源和将插座委托给包含 UIPickerView 的 UIViewController。 数据源方法在 UIViewController 实现中声明。假设您的选择器将显示：“英语”和“法语”：

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView 
{
    return 2;
}

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
    NSArray *pickerContent = [NSArray arrayWithObjects:@"English", @"French", nil];
    return [pickerContent objectAtIndex:row];
}

委托方法也在 UIViewController 实现中声明：

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    NSArray *titles = [NSArray arrayWithObjects:@"English", @"French", nil];
    NSString *userSelectionFromPicker = [titles objectAtIndex:row];
}

如何使用 userSelectionFromPicker 执行的一些示例应用程序中的操作：

视图控制器方法：[localMethod doSomethingWith:userSelectionFromPicker]
注意：userSelectionFromPicker 被设为视图控制器的属性（与局部变量相反）并由视图控制器的委托访问 - 通常在视图控制器被关闭时
当 userSelectionFromPicker 更改时调用通知

In Xcode, connect the datasource & delegate outlets to the UIViewController that contains the UIPickerView. The datasource methods are declared in the UIViewController implementation. Let's say your picker will display: "English" and "French":

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView 
{
    return 2;
}

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
    NSArray *pickerContent = [NSArray arrayWithObjects:@"English", @"French", nil];
    return [pickerContent objectAtIndex:row];
}

The delegate methods are also declared in the UIViewController implementation:

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    NSArray *titles = [NSArray arrayWithObjects:@"English", @"French", nil];
    NSString *userSelectionFromPicker = [titles objectAtIndex:row];
}

Some examples of how userSelectionFromPicker can be used to perform an action in the app:

A View Controller method: [localMethod doSomethingWith:userSelectionFromPicker]
NB: userSelectionFromPicker is made a property of the View Controller (as opposed to a local variable) and accessed by the View Controller's delegate - often when the View Controller is dismissed
A notification is invoked when userSelectionFromPicker changes

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