问题
Please do not vote this down. If it's not a good question I will remove it immediately but here is something I am very confused with.
I have a game in landscape view. Now, left of the screen is for my player to move around and right side of the screen is for its enemy to move around. Okay now, If I tab anywhere on right side of the screen, my player should shoot but if I tab left side of the screen, my player should move. so below is my code and I'm getting errors like this Thread 1 Signal or something in that nature. can you please help?
// TOUCH FUNCTIONS
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint touchLocation = [touch locationInNode:self.scene];
[self movePlayerToward:touchLocation];
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint touchLocation = [touch locationInNode:self.scene];
[self movePlayerToward:touchLocation];
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint touchLocation = [touch locationInNode:self.scene];
[self movePlayerToward:touchLocation];
CGPoint Combatzone = CGPointMake(self.size.width/2, self.size.height);
if((Combatzone.x = touchLocation.x) && (Combatzone.y = touchLocation.y))
{
// 1 - Set up initial location of projectile
SKSpriteNode * projectile = sprites;
projectile.position = _Player.position;
// 2- Determine offset of location to projectile
CGPoint offset = rwSub(touchLocation, projectile.position);
[self addChild:projectile];
// 5 - Get the direction of where to shoot
CGPoint direction = rwNormalize(offset);
// 6 - Make it shoot far enough to be guaranteed off screen
CGPoint shootAmount = rwMult(direction, 1000);
// 7 - Add the shoot amount to the current position
CGPoint realDest = rwAdd(shootAmount, projectile.position);
// 8 - Create the actions
float velocity = 480.0/1.0;
float realMoveDuration = self.size.width / velocity;
SKAction * actionMove = [SKAction moveTo:realDest duration:realMoveDuration];
SKAction * actionMoveDone = [SKAction removeFromParent];
[projectile runAction:[SKAction sequence:@[actionMove, actionMoveDone]]];
}
}
This is the error I get: as soon as I move my player character around the app stops and I get an error from main.m file which says Thread 1: signal SIGABRT and that is on the line that returns UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
回答1:
Try this code, but something to note
the player has to lift his finger between gunshots, if you want him to keep shooting as he drags his finger on the screen, then you have to modify the conditions in the touchesMoved and touchesBegan to match the one in the TouchesEnded
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint touchLocation = [touch locationInNode:self.scene];
if(touchLocation.x > self.size.width/2 )
[self movePlayerToward:touchLocation];
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint touchLocation = [touch locationInNode:self.scene];
if(touchLocation.x > self.size.width/2 )
[self movePlayerToward:touchLocation];
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint touchLocation = [touch locationInNode:self.scene];
if(touchLocation.x <= self.size.width/2 )//left side will shoot to change it to right side, invert the inequality sign
[self shoot:touchLocation];
else
[self movePlayerToward:touchLocation];
}
-(void)shoot:(CGPoint)touchLocation{
// 1 - Set up initial location of projectile
SKSpriteNode * projectile = sprites;
projectile.position = _Player.position;
// 2- Determine offset of location to projectile
CGPoint offset = rwSub(touchLocation, projectile.position);
[self addChild:projectile];
// 5 - Get the direction of where to shoot
CGPoint direction = rwNormalize(offset);
// 6 - Make it shoot far enough to be guaranteed off screen
CGPoint shootAmount = rwMult(direction, 1000);
// 7 - Add the shoot amount to the current position
CGPoint realDest = rwAdd(shootAmount, projectile.position);
// 8 - Create the actions
float velocity = 480.0/1.0;
float realMoveDuration = self.size.width / velocity;
SKAction * actionMove = [SKAction moveTo:realDest duration:realMoveDuration];
SKAction * actionMoveDone = [SKAction removeFromParent];
[projectile runAction:[SKAction sequence:@[actionMove, actionMoveDone]]];
}
Hope this helps, feel free to ask if something is unclear.
回答2:
First of all this condition
if((Combatzone.x = touchLocation.x) && (Combatzone.y = touchLocation.y))
is poorly constructed I hope you are aware that this condition assigns combat zone to touch location then if the resulting point is not equal to (0, 0) then this condition would be truly which is likely to be true most of the time, however I noticed that you gave it a different assignment in the previous line
CGPoint Combatzone = CGPointMake(self.size.width/2, self.size.height);
revise and tell us what condition are you trying to test.
as for the exception the only thing I can think of that my trigger this crash would be this line
SKSpriteNode * projectile = sprites;
sprites cannot be nil, and there is no way to infer from the code you shared how you handle the sprites variable.
if this doesn't help then my question to you, does the app crash while you are moving the character - after you have removed your finger from the screen or after the animation has ended?
来源：https://stackoverflow.com/questions/22876813/multiple-functions-in-touch-function-methods-sprite-kit