我正在尝试从self.mapView.gps.currentPoint
中提取x和y坐标,我该怎么办?
这是我到目前为止所做的:
NSLog(@"Location1 : %@", self.mapView.gps.currentPoint);
结果:
Location1 : AGSMutablePoint: x = 29841.008687, y = 40101.841687, spatial reference:
[AGSSpatialReference: wkid = 0, wkt = "PROJCS["SVY21",
GEOGCS[
"SVY21[WGS84]",
DATUM[
"D_WGS_1984",
SPHEROID["WGS_1984",6378137.0,298.257223563]
],
PRIMEM["Greenwich",0.0],
UNIT["Degree",0.0174532925199433]
],
PROJECTION["Transverse_Mercator"],
PARAMETER["False_Easting",28001.642],
PARAMETER["False_Northing",38744.572],
PARAMETER["Central_Meridian",103.8333333333333],
PARAMETER["Scale_Factor",1.0],
PARAMETER["Latitude_Of_Origin",1.366666666666667],
UNIT["Meter",1.0]
]"]`
如果我使用NSLog(@"Location2 : %@", self.mapView.gps.currentPoint.x);
它会给我一个错误的错误访问权。
答案 0 :(得分:2)
您的问题是NSLog
NSLog(@"Location2 : %@", self.mapView.gps.currentPoint.x);
%@
表示它期待一个obj-c对象。你传递的是CGFloat
。您应该将其替换为%f
或%g
(这两者都采用浮点值,但输出略有不同)。
NSLog(@"Location2 : %f", self.mapView.gps.currentPoint.x);