ios – 在Xcode更新到4.5版之后Button不起作用

我做了什么…

只需在故事板中的视图中添加一个Button和一个Label.在View Controller .h中,我向Label添加了一个Outlet并声明了IBAction.
文件：

.H

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController
@property (strong,nonatomic) IBOutlet UILabel *myLabel;

-(IBAction)button_pressed:(id)sender;
-(IBAction)swipe_active:(id)sender;

@end

.M

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController
@synthesize myLabel;

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view,typically from a nib.
    UISwipeGestureRecognizer *swipe_left = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe_active:)];
    swipe_left.direction = UISwipeGestureRecognizerDirectionLeft;
    [self.view addGestureRecognizer:swipe_left];
}

-(IBAction)button_pressed:(id)sender{
    myLabel.text=@"Button is Running";
}
-(IBAction)swipe_active:(id)sender{
    myLabel.text=@"Swipe is Running";
}

@end

只是按钮不起作用.

StoryBoard：https://i.stack.imgur.com/1hruM.png