前缀属性后面必须跟有接口或协议栈溢出

Question

[编译器错误]前缀属性后面必须跟有接口或协议栈溢出代码在前面工作正常。项目。我觉得自己像个白痴一样提出如此简单的问题。这东西有什么问题吗？

#import <UIKit/UIKit.h>
#import "FlipsideViewController.h"

@interface MainViewController : UIViewController <FlipsideViewControllerDelegate>
<UIPickerViewDelegate><UIPickerViewDataSource>

@property (strong, nonatomic) IBOutlet UITextField *inputText;
@property(strong, nonatomic) IBOutlet UIPickerView *picker;
@property(strong, nonatomic) IBOutlet UILabel *resultLabel;
@property(strong, nonatomic) NSArray *_convertFrom;
@property(strong, nonatomic) NSArray *_convertTo;
@property(strong, nonatomic) NSArray *_convertRates;
@property(strong, nonatomic) IBOutlet UILabel *formelLabel;
@property(strong, nonatomic) IBOutlet UITextField *inputText;


-(IBAction)textFieldReturn:(id)sender;
-(IBAction)backgroundTouched:(id)sender;


@end

Answer 1

您可以像这样声明对多个协议的一致性：

@interface MainViewController : UIViewController <FlipsideViewControllerDelegate, UIPickerViewDelegate, UIPickerViewDataSource>

不适用于多个尖括号组。