小编use*_*689的帖子

我正在建立一个简单的游戏应用程序,你必须将球从另一个球移开.但是,我的代码有问题,请帮忙.当我构建并运行它时,我收到2条错误消息.我不明白问题是什么.

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];
//(X speed, Y speed) vvv
pos = CGPointMake(5.0,4.0);///////// this part here I get an error message saying assigning to CGPoint * (aka 'struct CGPoint*') from incompatible type 'CGPoint' (aka 'struct CGPoint')
}

- (IBAction)start {
[startbutton setHidden:YES];
randomMain = [NSTimer scheduledTimerWithTimeInterval:(0.03) target:(self) selector:@selector(onTimer) userInfo:nil repeats:YES];

}

-(void)onTimer {
[self checkCollision];

enemy.center = CGPointMake(enemy.center.x+pos->x,enemy.center.y+pos->y);

if (enemy.center.x > 320 || enemy.center.x < 0)
    pos->x = -pos->x;

if (enemy.center.y …