与Swift集成Objective C协议

Weles 发表于 Dev

韦尔斯

我是新手，我需要一些帮助来集成组件AKPickerView（用Objective C编写）。组件链接：https : //github.com/Akkyie/AKPickerView

但是我没有成功，因为有一个协议：AKPickerViewDelegate在Swift中不起作用：

@class AKPickerView;

@protocol AKPickerViewDelegate <NSObject>
@optional
- (NSString *)pickerView:(AKPickerView *)pickerView titleForItem:(NSInteger)item;
- (NSUInteger)numberOfItemsInPickerView:(AKPickerView *)pickerView;
- (void)pickerView:(AKPickerView *)pickerView didSelectItem:(NSInteger)item;
@end

在Swift中，我编写了以下代码：

class ViewController: UIViewController, AKPickerViewDelegate {

var pickerView : AKPickerView = AKPickerView()
var titles     : NSArray = ["Janeiro","Fevereiro","Março","Abril","Maio"]

...

我暗示了这种方法：

func numberOfItemsInPickerView(pickerView : AKPickerView!) -> Int{

    return self.titles.count
}


func pickerView(pickerView: AKPickerView, titleForItem item : NSInteger) -> NSString {

    return self.titles[item] as NSString
}

但是编译器显示此错误：

Type 'ViewController' does not conform to protocol 'AKPickerViewDelegate'

感谢一些帮助，谢谢！

编码器

正如我在链接AKPickerViewDelegate中看到的那样，需要使用方法。

@protocol AKPickerViewDelegate <NSObject>
@required
- (NSUInteger)numberOfItemsInPickerView:(AKPickerView *)pickerView;
- (NSString *)pickerView:(AKPickerView *)pickerView titleForItem:(NSInteger)item;
@optional
- (void)pickerView:(AKPickerView *)pickerView didSelectItem:(NSInteger)item;
@end

因此，您需要快速实现它们。按如下所示实施这些方法，它将消除错误

func numberOfItemsInPickerView(pickerView: AKPickerView!) -> UInt {

    return self.titles.count
}

func pickerView(pickerView: AKPickerView!, titleForItem item: Int) -> String! {

   return self.titles[item]
}

请注意，您还需要在桥接标题中添加它们#import "AKPickerView.h"。Swifter-Bridging-Header.h

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