gif5新文件.gif
当移动地图后屏幕内没有maker时，出现指引的悬浮按钮，效果还是很酷炫的。
实现原理就是计算出屏幕中心和maker形成的夹角a，然后根据屏幕宽高比形成的夹角b和a作比较，把maker分为上下左右四组，再分别选出四组里离当前屏幕中心最近的点，即最多在屏幕的上下左右各悬浮一个指引按钮
根据形成的夹角a将maker分为上下左右四组
NSMutableArray *topArr = [NSMutableArray array];
NSMutableArray *leftArr = [NSMutableArray array];
NSMutableArray *botArr = [NSMutableArray array];
NSMutableArray *rightArr = [NSMutableArray array];
for (CustomInTurnAnnotationModel *model in dataSourceAnnotations)
{
CGPoint p = [mapView convertCoordinate:model.coordinate toPointToView:view];
float angle = atan2(p.y - SCREEN_HEIGHT/2.f,p.x - SCREEN_WIDTH/2.f) * (180.0 / M_PI);//场所和屏幕中心形成的角度
if (angle < 0.f) {
angle += 360;
}
float angleScreen = atan2(-SCREEN_HEIGHT/2.f,-SCREEN_WIDTH/2.f) * (180.0 / M_PI) + 180;//屏幕中心和原点形成的角度
if (angle >= 180 + angleScreen && angle < 360 - angleScreen)
{//上
[topArr addObject:model];
}else if (angle < 180 + angleScreen && angle >= 180 - angleScreen)
{//左
[leftArr addObject:model];
}else if (angle < 180 - angleScreen && angle >= angleScreen)
{//下
[botArr addObject:model];
}else
{//右
[rightArr addObject:model];
}
}
计算出四组maker，离当前屏幕中心的距离
NSMutableArray *disTop = [NSMutableArray array];//顶部场所和屏幕中心距离
for (int i = 0; i < topArr.count; i++)
{
CustomInTurnAnnotationModel *model = [topArr objectAtIndex:i];
CLLocationCoordinate2D convertPoint = [mapView convertPoint:CGPointMake(SCREEN_WIDTH/2.f, SCREEN_HEIGHT/2.f) toCoordinateFromView:view];
double dis = [self distancePoint1:model.coordinate Point2:convertPoint];
NSString *diss = [NSString stringWithFormat:@"%.2f",dis];
[disTop addObject:diss];
}
NSMutableArray *disLeft = [NSMutableArray array];//左部场所和屏幕中心距离
for (int i = 0; i < leftArr.count; i++)
{
CustomInTurnAnnotationModel *model = [leftArr objectAtIndex:i];
CLLocationCoordinate2D convertPoint = [mapView convertPoint:CGPointMake(SCREEN_WIDTH/2.f, SCREEN_HEIGHT/2.f) toCoordinateFromView:view];
double dis = [self distancePoint1:model.coordinate Point2:convertPoint];
NSString *diss = [NSString stringWithFormat:@"%.2f",dis];
[disLeft addObject:diss];
}
NSMutableArray *disBot = [NSMutableArray array];//底部场所和屏幕中心距离
for (int i = 0; i < botArr.count; i++)
{
CustomInTurnAnnotationModel *model = [botArr objectAtIndex:i];
CLLocationCoordinate2D convertPoint = [mapView convertPoint:CGPointMake(SCREEN_WIDTH/2.f, SCREEN_HEIGHT/2.f) toCoordinateFromView:view];
double dis = [self distancePoint1:model.coordinate Point2:convertPoint];
NSString *diss = [NSString stringWithFormat:@"%.2f",dis];
[disBot addObject:diss];
}
NSMutableArray *disRight = [NSMutableArray array];//右部场所和屏幕中心距离
for (int i = 0; i < rightArr.count; i++)
{
CustomInTurnAnnotationModel *model = [rightArr objectAtIndex:i];
CLLocationCoordinate2D convertPoint = [mapView convertPoint:CGPointMake(SCREEN_WIDTH/2.f, SCREEN_HEIGHT/2.f) toCoordinateFromView:view];
double dis = [self distancePoint1:model.coordinate Point2:convertPoint];
NSString *diss = [NSString stringWithFormat:@"%.2f",dis];
[disRight addObject:diss];
}
再分别从上面四个距离数组中找出最近的一个maker
#pragma mark - 查找离屏幕某个方向最近的点
- (NSInteger)findNearModel:(NSMutableArray *)array
{
if (array.count > 0)
{
double dis0 = [array[0] floatValue];
NSInteger index = 0;
for (int i = 1; i < array.count; i++)
{
NSString *diss = [array objectAtIndex:i];
double dis = [diss floatValue];
if (dis0 > dis) {
dis0 = dis;
index = i;
}
}
return index;
}
return -1;
}
分别设置上下左右四个悬浮按钮的大小和位置，有一个滑动范围
CGPoint p = [mapView convertCoordinate:model.coordinate toPointToView:view];
float angle = atan2(p.y - SCREEN_HEIGHT/2.f,p.x - SCREEN_WIDTH/2.f) * (180.0 / M_PI);//场所和屏幕中心形成的角度
if (angle < 0.f) {
angle += 360;
}
float angleScreen = atan2(-SCREEN_HEIGHT/2.f,-SCREEN_WIDTH/2.f) * (180.0 / M_PI) + 180;//屏幕中心和原点形成的角度
if (angle >= 180 + angleScreen && angle < 360 - angleScreen)
{//上
CGFloat scalet = (angle - 180 - angleScreen)/(180 - 2*angleScreen);// 0<=scalet<1
CGFloat topL = SCREEN_WIDTH * scalet;
CGFloat titlew = 0;
if (![self isNullOrNilWithObject:model.nameStr])
{
titlew = [self getStringWidth:model.nameStr andFont:15.f] + 22;
}
titlew = MAX(titlew, 50);
titlew = MIN(titlew, SCREEN_WIDTH - 42);
CGFloat w = titlew;//场所文字的宽度
topL -= w/2.f;
topL = MAX(topL, 10);
topL = MIN(topL, SCREEN_WIDTH - 10 - w);
self.topLabel.text = model.nameStr;
[UIView animateWithDuration:0.1 animations:^{
self.topViewLeft.constant = topL;
[self layoutIfNeeded];
}];
self.topViewWidth.constant = w;
self.topView.hidden = false;
}else if (angle < 180 + angleScreen && angle >= 180 - angleScreen)
{//左
CGFloat scalel = 1 - (angle - 180 + angleScreen)/(2*angleScreen);// 0<scalet<=1
CGFloat leftT = SCREEN_HEIGHT * scalel;
CGFloat titlew = 0;
if (![self isNullOrNilWithObject:model.nameStr])
{
titlew = [self getStringWidth:model.nameStr andFont:15.f] + 42;
}
titlew = MAX(titlew, 50);
titlew = MIN(titlew, SCREEN_WIDTH - 30);
CGFloat w = titlew + 20;//场所文字的宽度
leftT -= 19.f;
leftT = MAX(leftT, 68);
leftT = MIN(leftT, SCREEN_HEIGHT - 78 - 48);
self.leftLabel.text = model.nameStr;
[UIView animateWithDuration:0.1 animations:^{
self.leftViewTop.constant = leftT;
[self layoutIfNeeded];
}];
self.leftViewWidth.constant = w;
self.leftView.hidden = false;
}else if (angle < 180 - angleScreen && angle >= angleScreen)
{//下
CGFloat scaleb = 1 - (angle - angleScreen)/(180 - 2*angleScreen);// 0<scalet<=1
CGFloat botL = SCREEN_WIDTH * scaleb;
CGFloat titlew = 0;
if (![self isNullOrNilWithObject:model.nameStr])
{
titlew = [self getStringWidth:model.nameStr andFont:15.f] + 22;
}
titlew = MAX(titlew, 50);
titlew = MIN(titlew, SCREEN_WIDTH - 42);
CGFloat w = titlew;//场所文字的宽度
botL -= w/2.f;
botL = MAX(botL, 10);
botL = MIN(botL, SCREEN_WIDTH - 10 - w);
self.bottomLabel.text = model.nameStr;
[UIView animateWithDuration:0.1 animations:^{
self.bottomLeft.constant = botL;
[self layoutIfNeeded];
}];
self.bottomWidth.constant = w;
self.bottomView.hidden = false;
}else
{//右
CGFloat q = angle + angleScreen;
if (angle >= 360 - angleScreen && angle < 360)
{
q = angle - 360 + angleScreen;
}
CGFloat scaler = q/(2*angleScreen);// 0<=scalet<1
CGFloat rightT = SCREEN_HEIGHT * scaler;
CGFloat titlew = 0;
if (![self isNullOrNilWithObject:model.nameStr])
{
titlew = [self getStringWidth:model.nameStr andFont:15.f] + 42;
}
titlew = MAX(titlew, 50);
titlew = MIN(titlew, SCREEN_WIDTH - 30);
CGFloat w = titlew + 20;//场所文字的宽度
rightT -= 19.f;
rightT = MAX(rightT, 68);
rightT = MIN(rightT, SCREEN_HEIGHT - 48 - 78);
self.rightLabel.text = model.nameStr;
[UIView animateWithDuration:0.1 animations:^{
self.rightViewTop.constant = rightT;
[self layoutIfNeeded];
}];
self.rightViewWidth.constant = w;
self.rightView.hidden = false;
}
因为高德API比较大，cocoapods没有下载API 终端cd到文件目录pod install 一下就可以了DEMO地址戳这里记得star一下哦
以上。
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