SpriteKit 中的更新方法不能正确更新时间
Update method in SpriteKit doesn't update time propely
如果我在更新方法中实现该方法,我想以秒为单位计算它只在第一秒有效,然后它会不停地打印数字,而不会在打印下一个数字之前等待一秒钟;
我不明白为什么会这样
-(void) countinSeconds{
SKAction *count = [SKAction waitForDuration:1];
SKAction *time = [SKAction runBlock:^{
timex++;
}];
SKAction *print = [SKAction runBlock:^{
NSLog(@"%i",timex);
}];
[self runAction:[SKAction sequence:@[count,time,print]]];
}
-(void)update:(NSTimeInterval)currentTime {
[self countinSeconds];
}
不需要为此使用操作; update:
方法是在当前时间传递的,所以只需记住您何时开始并做一些简单的数学运算即可:
@implementation YourClass () {
BOOL _started;
NSTimeInterval _startTime;
NSUInteger _lastLogTime;
}
@end
@implementation YourClass
- (void)update:(NSTimeInterval)currentTime
{
if (!_started) {
_startTime = currentTime;
_started = YES;
} else {
NSUInteger elapsedTime = (NSUInteger)(currentTime - _startTime);
if (elapsedTime != _lastLogTime) {
NSLog(@"Tick: %lu", elapsedTime);
_lastLogTime = elapsedTime;
}
}
}
@end
以下是使用 SKAction 的方法:
您不想 运行 update: 中的那个方法,而是在其他地方,比如 didMoveToView:
-(void)didMoveToView:(SKView *)view {
[self countinSeconds];
}
此外,您不需要两个方块:
-(void) countinSeconds{
SKAction *wait = [SKAction waitForDuration:1];
SKAction *print = [SKAction runBlock:^{
timex++;
NSLog(@"%i",timex);
}];
[self runAction:[SKAction repeatActionForever:[SKAction sequence:@[wait,print]]] withKey:@"counting"];
}
要停止计时器,您可以随时删除与 "counting" 键关联的操作,如下所示:
if([self actionForKey: @"counting"){[self removeActionForKey:@"counting"];}
如果我在更新方法中实现该方法,我想以秒为单位计算它只在第一秒有效,然后它会不停地打印数字,而不会在打印下一个数字之前等待一秒钟; 我不明白为什么会这样
-(void) countinSeconds{
SKAction *count = [SKAction waitForDuration:1];
SKAction *time = [SKAction runBlock:^{
timex++;
}];
SKAction *print = [SKAction runBlock:^{
NSLog(@"%i",timex);
}];
[self runAction:[SKAction sequence:@[count,time,print]]];
}
-(void)update:(NSTimeInterval)currentTime {
[self countinSeconds];
}
不需要为此使用操作; update:
方法是在当前时间传递的,所以只需记住您何时开始并做一些简单的数学运算即可:
@implementation YourClass () {
BOOL _started;
NSTimeInterval _startTime;
NSUInteger _lastLogTime;
}
@end
@implementation YourClass
- (void)update:(NSTimeInterval)currentTime
{
if (!_started) {
_startTime = currentTime;
_started = YES;
} else {
NSUInteger elapsedTime = (NSUInteger)(currentTime - _startTime);
if (elapsedTime != _lastLogTime) {
NSLog(@"Tick: %lu", elapsedTime);
_lastLogTime = elapsedTime;
}
}
}
@end
以下是使用 SKAction 的方法:
您不想 运行 update: 中的那个方法,而是在其他地方,比如 didMoveToView:
-(void)didMoveToView:(SKView *)view {
[self countinSeconds];
}
此外,您不需要两个方块:
-(void) countinSeconds{
SKAction *wait = [SKAction waitForDuration:1];
SKAction *print = [SKAction runBlock:^{
timex++;
NSLog(@"%i",timex);
}];
[self runAction:[SKAction repeatActionForever:[SKAction sequence:@[wait,print]]] withKey:@"counting"];
}
要停止计时器,您可以随时删除与 "counting" 键关联的操作,如下所示:
if([self actionForKey: @"counting"){[self removeActionForKey:@"counting"];}