Swift：點在多邊形？如何檢查用戶的位置是否屬於Geo-JSON多邊形？

Question

我有一個用戶的位置座標。鑑於位置位於其中一個多邊形中，我如何使用Swift或Objective-C通過OBJECTID返回其所屬的多邊形？

樣品JSON多邊形數據我使用看起來像這樣：

{ 「類型」： 「功能」， 「屬性」：{ 「OBJECTID」：10 「District_N」： 「10」，「WARD 「：10」，「geometry」：{「type」：「Polygon」，「coordinates」：[[[87.52389,41.742767]，[-87.524668,41.644637]，[-87.578588,41.64473]，[-87.580619,41.65028 ]，[-87.601709,41.676572]，[-87.60172,41.685837]，[-87.592251,41.703002]，[-87.592202,41.707656]，[-87.586051,41.707765]，[-87.585322,41.709059]，[-87.585162,41.720732] ，[-87.563165,41.698022]，[-87.563275,41.706395]，[-87.559645,41.706399]，[-87.559775,41.715404]，[-87.569434,41.715639]，[-87.566814,41.716484]，[-87.565902,41.722585]，[ [-87.556604,41.722701]，[-87.556693,41.726351]，[-87.554907,41.726374 ]，[-87.557838,41.729746]，[-87.552593,41.728313]，[-87.552639,41.73003]，[-87.555405,41.73003]，[-87.555585,41.737329]，[-87.556887,41.737313]，[-87.555191,41.744277] ，[-87.551526,41.742147]，[-87.550325,41.744674]，[-87.541923,41.744779]，[-87.541772,41.741144]，[-87.529645,41.741412]，[-87.530874,41.748023]，[-87.544007,41.753548]， [-87.540739,41.757435]，[-87.524445,41.760035]，[-87.52389,41.742767]]]}} , {「type」：「Feature」，「properties」：{「OBJECTID」：11，「District_N」 ：「11」，「WARD」：11}，「geometry」：{「type」：「Polygon」，「coordinates」：[[[-87.647655,41,774319]，[-87.645662,41,774331]，[-87.644767,41.867185 ]，[-87.639218,41.867254]，[-87.639014,41.860018]，[-87.64194,41.859984]，[-87.641864,41.857621]，[-87.639967,41.857648]，[-87.644938,41.852666]，[-87.638532,41.852792] ，[-87.640478,41.849467]，[-87.631965,41.848252]，[-8 7.629944，41.846683]，[-87.629594，41.83097]，[-87.631504，41.830939]，[-87.631465，41.829064]，[-87.633842，41.827265]，[-87.633763，41.823616]，[-87.636354，41.823583]，[-87.635839 ，41.809046]，[-87.640679，41.808952]，[-87.641275，41.805025]，[-87.645432，41.80494]，[-87.645538，41.808864]，[-87.65524，41.808734]，[-87.655246，41.81237]，[-87.665064， 41.812222]，[-87.665568，41.830501]，[-87.657712，41.830726]，[-87.66436，41.839375]，[-87.664449，41.844617]，[-87.658043，41.847724]，[-87.646473，41.84919]，[-87.646495，41.852647 ]，[-87.648132，41.852613]，[-87.647673，41.859898]，[-87.656479，41.859765]，[-87.656554，41.862513]，[-87.650937，41.863499]，[-87.652815，41.873034]，[-87.647655，41.874319] ]]}}

Answer 1

創建貝塞爾路徑（請確保您關閉它），然後使用containsPoint方法。您可以使用usesEvenOddFillRule屬性選擇'contains'算法。更多信息可在蘋果的文檔中找到。