我是一个 Objective-C 初学者，我不确定哪里出了问题，所以非常感谢一些帮助。
警告内容为“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
我很抱歉这么多代码（只是想确保它包含你想知道的内容）谢谢你一百万的帮助