objective-c - prefix 属性后面必须跟一个接口(interface)或协议(protocol)栈溢出

Question

[编译器错误]前缀属性后面必须有接口(interface)或协议(protocol)栈溢出代码在 prev 中运行良好。项目。我觉得发布这样一个简单的问题是个白痴。这东西怎么了？

#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

你像这样声明符合多个协议(protocol):

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

不适用于多个尖括号集。