使用 CGPointmake 和 NSSTimer 的非常基本的动画？

Question

我在 YouTube 上观看了有关制作 Flappy Bird 克隆的教程。代码使用CGPointMake() 和一个整数变量和一个计时器来在屏幕上上下移动小鸟，但我复制的代码不会导致小鸟移动。

Viewcontroller.h

int BirdFlight;

@interface ViewController : UIViewController{

    IBOutlet UIImageView *Bird;
    IBOutlet UIButton *StartGame;

    NSTimer *BirdMovement;
}

- (IBAction)StartGame:(id)sender;
-(void)BirdMoving;

@end

Viewcontroller.m（所有更改）

@implementation ViewController

-(IBAction)StartGame:(id)sender{
    StartGame.hidden = YES;
    BirdMovement  = [NSTimer timerWithTimeInterval:0.05 target:self
                                          selector:@selector(BirdMoving) userInfo:nil repeats:YES];
}

- (void)BirdMoving {

    Bird.center = CGPointMake(Bird.center.x, Bird.center.y - BirdFlight);
    BirdFlight = BirdFlight - 5;

    if (BirdFlight < -15) {
        BirdFlight = -15;
    }

    if (BirdFlight > 0) {
        Bird.image = [UIImage imageNamed:@"BirdUp.png"];      
    }

    if (BirdFlight < 0) {
        Bird.image = [UIImage imageNamed:@"2.png"];
    }
}

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {    
    BirdFlight = 30;
}

我不想使用任何其他方法来制作动画我只是想知道如何使代码像视频中那样工作。 (https://www.youtube.com/watch?v=RKG6fsM5JiA)

Answer 1

[NSTimer timerWithTimeInterval:0.05 target:self
                          selector:@selector(BirdMoving) userInfo:nil repeats:YES];

应该是

[NSTimer scheduledTimerWithTimeInterval:0.05 target:self selector:@selector(BirdMoving) userInfo:nil repeats:YES];