在watch os 2运行时更新wkinterfacecontroller的方法

In Header file

在头文件

#import <WatchKit/WatchKit.h>
#import <Foundation/Foundation.h>
#import <WatchConnectivity/WatchConnectivity.h>

@interface InterfaceController : WKInterfaceController<WCSessionDelegate>
- (IBAction)lastSongButtonClick;
- (IBAction)playSongButtonClick;
- (IBAction)nextSongButtonClick;
@property (strong, nonatomic) IBOutlet WKInterfaceLabel *songTitleLabel;
@property (strong, nonatomic) IBOutlet WKInterfaceButton *playSongButton;

@end
#import <WatchKit/Watch