Question

我是一名Objective-C初学者，我不确定它出了什么问题所以非常感谢一些帮助。
警告显示“使用未声明的标识符'更新'”

- (void) update {

    NSTimeInterval secondsSinceLastDraw = -([self.lastUpdateTime timeIntervalSinceNow]);

    self.pacmanYVelocity = self.pacmanYVelocity - (self.acceleration.x * secondsSinceLastDraw);
    self.pacmanXVelocity = self.pacmanXVelocity - (self.acceleration.y * secondsSinceLastDraw);

    CGFloat xDelta = secondsSinceLastDraw * self.pacmanXVelocity * 500;
    CGFloat yDelta = secondsSinceLastDraw * self.pacmanYVelocity * 500;

    self.currentPoint = CGPointMake(self.currentPoint.x + xDelta,
                                    self.currentPoint.y + yDelta);

    [self movePacman];

    self.lastUpdateTime = [NSDate date];

}

这是ViewController.h

#import <UIKit/UIKit.h>
#import <QuartzCore/CAAnimation.h>
#import <CoreMotion/CoreMotion.h>
#define kUpdateInterval (1.0f / 60.0f)


@interface ViewController : UIViewController

@property (strong, nonatomic) IBOutlet UIImageView *pacman;
@property (strong, nonatomic) IBOutlet UIImageView *ghost1;
@property (strong, nonatomic) IBOutlet UIImageView *ghost2;
@property (strong, nonatomic) IBOutlet UIImageView *ghost3;
@property (strong, nonatomic) IBOutlet UIImageView *exit;

@property (strong, nonatomic) IBOutletCollection(UIImageView) NSArray *wall;

@property (assign, nonatomic) CGPoint currentPoint;
@property (assign, nonatomic) CGPoint previousPoint;
@property (assign, nonatomic) CGFloat pacmanXVelocity;
@property (assign, nonatomic) CGFloat pacmanYVelocity;
@property (assign, nonatomic) CGFloat angle;
@property (assign, nonatomic) CMAcceleration acceleration;
@property (strong, nonatomic) CMMotionManager  *motionManager;
@property (strong, nonatomic) NSOperationQueue *queue;
@property (strong, nonatomic) NSDate *lastUpdateTime;

@end

这就是.m

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
self.view.backgroundColor = [UIColor blackColor];
CGPoint origin1 = self.ghost1.center;
CGPoint target1 = CGPointMake(self.ghost1.center.x, self.ghost1.center.y-124);

CABasicAnimation *bounce1 = [CABasicAnimation animationWithKeyPath:@"position.y"];
bounce1.fromValue = [NSNumber numberWithInt:origin1.y];
bounce1.toValue = [NSNumber numberWithInt:target1.y];
bounce1.duration = 2;
bounce1.autoreverses = YES;
bounce1.repeatCount = HUGE_VALF;
[self.ghost1.layer addAnimation:bounce1 forKey:@"position"];

CGPoint origin2 = self.ghost2.center;
CGPoint target2 = CGPointMake(self.ghost2.center.x, self.ghost2.center.y+284);
CABasicAnimation *bounce2 = [CABasicAnimation animationWithKeyPath:@"position.y"];
bounce2.fromValue = [NSNumber numberWithInt:origin2.y];
bounce2.toValue = [NSNumber numberWithInt:target2.y];
bounce2.duration = 2;
bounce2.repeatCount = HUGE_VALF;
bounce2.autoreverses = YES;
[self.ghost2.layer addAnimation:bounce2 forKey:@"position"];

CGPoint origin3 = self.ghost3.center;
CGPoint target3 = CGPointMake(self.ghost3.center.x, self.ghost3.center.y-284);
CABasicAnimation *bounce3 = [CABasicAnimation animationWithKeyPath:@"position.y"];
bounce3.fromValue = [NSNumber numberWithInt:origin3.y];
bounce3.toValue = [NSNumber numberWithInt:target3.y];
bounce3.duration = 2;
bounce3.repeatCount = HUGE_VALF;
bounce3.autoreverses = YES;
[self.ghost3.layer addAnimation:bounce3 forKey:@"position"];

// Movement of pacman

self.lastUpdateTime = [[NSDate alloc] init];

self.currentPoint  = CGPointMake(0, 144);
self.motionManager = [[CMMotionManager alloc]  init];
self.queue         = [[NSOperationQueue alloc] init];

self.motionManager.accelerometerUpdateInterval = kUpdateInterval;

[self.motionManager startAccelerometerUpdatesToQueue:self.queue withHandler:
 ^(CMAccelerometerData *accelerometerData, NSError *error) {
     [(id) self setAcceleration:accelerometerData.acceleration];
     [self performSelectorOnMainThread:@selector(update) withObject:nil waitUntilDone:NO];
 }];

**- (void) update {** 

    NSTimeInterval secondsSinceLastDraw = -([self.lastUpdateTime timeIntervalSinceNow]);

    self.pacmanYVelocity = self.pacmanYVelocity - (self.acceleration.x * secondsSinceLastDraw);
    self.pacmanXVelocity = self.pacmanXVelocity - (self.acceleration.y * secondsSinceLastDraw);

    CGFloat xDelta = secondsSinceLastDraw * self.pacmanXVelocity * 500;
    CGFloat yDelta = secondsSinceLastDraw * self.pacmanYVelocity * 500;

    self.currentPoint = CGPointMake(self.currentPoint.x + xDelta,
                                    self.currentPoint.y + yDelta);

    [self movePacman];

    self.lastUpdateTime = [NSDate date];

}

- (void)movePacman {

    self.previousPoint = self.currentPoint;

    CGRect frame = self.pacman.frame;
    frame.origin.x = self.currentPoint.x;
    frame.origin.y = self.currentPoint.y;

    self.pacman.frame = frame;
}


[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

我很抱歉这大量的代码（只是想确保它包含你想知道的内容）谢谢你们一百万的帮助

Answer 1

如果该代码完全与.m文件中的代码完全相同，那么您将错过}

的右括号（-viewDidLoad）

Objective-C未声明的标识符

1 个答案: