Ios 如何在谷歌地图中实现类似缩放
我正在开发一个带有一些游戏场的游戏,在一些视图中绘制。我的比赛场地总是和他的中锋相对,所以我只需要简单的挤压Ios 如何在谷歌地图中实现类似缩放,ios,objective-c,uipinchgesturerecognizer,Ios,Objective C,Uipinchgesturerecognizer,我正在开发一个带有一些游戏场的游戏,在一些视图中绘制。我的比赛场地总是和他的中锋相对,所以我只需要简单的挤压 - (void)pinch:(UIPinchGestureRecognizer *)gesture { if ((gesture.state == UIGestureRecognizerStateChanged) || (gesture.state == UIGestureRecognizerStateEnded)) { self.gameBoardGridView.sc
- (void)pinch:(UIPinchGestureRecognizer *)gesture
{
if ((gesture.state == UIGestureRecognizerStateChanged) ||
(gesture.state == UIGestureRecognizerStateEnded)) {
self.gameBoardGridView.scale *= gesture.scale; // adjust our scale
gesture.scale = 1;
}
和潘
-(void)pan:(UIPanGestureRecognizer *)recognizer
{
CGPoint translatedPoint = [recognizer translationInView:self.gameBoardGridView];
self.gameBoardGridView.gridCenter = CGPointMake(self.gameBoardGridView.gridCenter.x + translatedPoint.x, self.gameBoardGridView.gridCenter.y + translatedPoint.y);
[recognizer setTranslation:CGPointMake(0, 0) inView:self.gameBoardGridView];
}
但我需要另一种变焦。当您放下两个手指,然后移动其中一个手指时,场会像应该的那样展开(放大),但手指下的像素不再位于手指下。图像从图像中心开始缩放,而不是从两个手指之间的中点开始缩放
我尝试了很多例子,但没有一个像我想要的那样有效。最后我写了这个,它几乎正确,但不完全正确
- (void)pinch:(UIPinchGestureRecognizer *)gesture
{
CGFloat curScale = gesture.scale;
static CGPoint startPoint;
if (gesture.state == UIGestureRecognizerStateBegan) {
startPoint = [gesture locationInView:self.gameBoardGridView];
}
if ((gesture.state == UIGestureRecognizerStateChanged) ||
(gesture.state == UIGestureRecognizerStateEnded)) {
self.gameBoardGridView.scale *= gesture.scale;
CGFloat widthDelta = self.gameBoardGridView.gridWidth * fabs(gesture.scale - 1) / 3;
CGFloat heightDelta = self.gameBoardGridView.gridHeight * fabs(gesture.scale - 1) / 3;
gesture.scale = 1;
CGPoint lastPoint = self.gameBoardGridView.gridCenter;
const CGFloat epsilon = 5;
CGFloat coef = 1.0;
if(curScale < 1) {
coef = -1.0;
}
if (startPoint.x + epsilon < self.view.frame.size.width / 2) {
lastPoint.x += widthDelta*coef;
}
else if (startPoint.x - epsilon > self.view.frame.size.width / 2) {
lastPoint.x -= widthDelta*coef;
}
if (startPoint.y + epsilon < self.view.frame.size.height / 2) {
lastPoint.y += heightDelta*coef;
}
else if (startPoint.y - epsilon > self.view.frame.size.height / 2) {
lastPoint.y -= heightDelta*coef;
}
self.gameBoardGridView.gridCenter = lastPoint;
}
}
-(void)pinch:(UIPinchGestureRecognizer*)手势
{
CGFloat curScale=手势.scale;
静态CGPoint起始点;
if(signature.state==UIGestureRecognitizerStateStart){
startPoint=[手势位置视图:self.gameBoardGridView];
}
如果((手势.state==UIGestureRecognitizerStateChanged)||
(手势.state==UIGestureRecognitzerStateEnded)){
self.gameBoardGridView.scale*=手势.scale;
CGFloat widthDelta=self.gameBoardGridView.gridWidth*fabs(signature.scale-1)/3;
CGFloat heightDelta=self.gameBoardGridView.gridHeight*fabs(signature.scale-1)/3;
1.scale=1;
CGPoint lastPoint=self.gameBoardGridView.gridCenter;
常数CGFloatε=5;
cgf=1.0;
如果(光标<1){
coef=-1.0;
}
if(startPoint.x+epsilonself.view.frame.size.width/2){
lastPoint.x-=宽度增量*系数;
}
if(起始点y+epsilonself.view.frame.size.height/2){
lastPoint.y-=高度增量*系数;
}
self.gameBoardGridView.gridCenter=lastPoint;
}
}
可能还有其他方法可以做到这一点吗 缩放的中心是图像的定位点。 你所要做的就是将锚点改为手指的中点、位置和位置。 我自己没有试过,我在这里看到了一个完整的解决方案,也许它会帮助你-
您是否尝试过使用
UIScrollView
?我也做了类似的事情。我开始使用本教程,然后为我的应用程序添加了一些特定的代码