iPhone 比较课程价值的问题

发布于 2024-08-28 08:48:03 字数 529 浏览 8 评论 0原文

我正在编写一些代码来获取一些值，包括课程

    -(void) locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation   *)newLocation fromLocation:(CLLocation *)oldLocation {
    //somecode
    NSString *dirString = [[NSString alloc] initWithFormat:@"%d", newLocation.course];
    int myInt = [dirString intValue];
    if ((myInt >= 0) || (myint  < 90)) {course.text =@ "N";}
    if ((myInt >= 90) || (myint  < 180)) {course.text =@ "E";}

等，但我总是检索第一个值“N”。

我的错误在哪里？

谢谢！

原文

i'm writing some code for getting some values including course

    -(void) locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation   *)newLocation fromLocation:(CLLocation *)oldLocation {
    //somecode
    NSString *dirString = [[NSString alloc] initWithFormat:@"%d", newLocation.course];
    int myInt = [dirString intValue];
    if ((myInt >= 0) || (myint  < 90)) {course.text =@ "N";}
    if ((myInt >= 90) || (myint  < 180)) {course.text =@ "E";}

and so on, but i always retrieve the first value, "N".

where's my mistake?

Thank's!

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梦亿 2024-09-04 08:48:03

您可能需要将逻辑 OR 更改为逻辑与（将 || 更改为 &&），这将确保该值介于 0 和 90 之间，或者 90 和180.

由于逻辑或，逻辑对我来说似乎也有点缺陷，也许我不理解你所做的假设 - 但如果该值是，比如说，200，它将通过第一个 if 因为 200 大于 0。然后它也会通过第二个 if，因为 200 大于 90。由于逻辑 OR，它们会通过。只有其中一个语句 (>= 0 OR < 90) 必须为真才能通过。

这可以通过使用逻辑 AND 来解决。

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调妓 2024-09-04 08:48:03

您不需要通过 NSString 来检查课程，但错误的根本原因是课程是双精度的，您应该在字符串格式中使用 %f 。

较短：

double theCourse = newLocation.course;
if ((theCourse >= 0) || (theCourse  < 90)) {course.text =@ "N";}
if ((theCourse >= 90) || (theCourse  < 180)) {course.text =@ "E";}

但实际上我认为你的算法是错误的。如果路线为 0<=course<45 或 315<=course<360 ，则您将前往北方。

You don't need to go via NSString to check the course, but the root cause of your bug is that the course is a double, you should use %f in the formating of your string.

shorter :



double theCourse = newLocation.course;

if ((theCourse >= 0) || (theCourse  < 90)) {course.text =@ "N";}

if ((theCourse >= 90) || (theCourse  < 180)) {course.text =@ "E";}

But actually I think your algo is wrong. You're going to the north if the course is 0<=course<45 or 315<=course<360 .

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记忆消瘦 2024-09-04 08:48:03

@yonel

谢谢，课程是学位:-(
但我不明白你的算法，阅读苹果文档我发现了这一点：

Thus, north is 0 degrees, east is 90degrees, south is180 
degrees, and so on. Course values may not be available on all 
devices.

对我来说这意味着

course between 0 and 44= North;
course between 45 and 89= NE; 
course between 90 and 134= East; 
course between 135 and 179= SouthEast;
course between 180 and 234= South;
course between 235 and 269= SouthWest;
course between 270 and 314= West;
course between 315 and 360 = NorthWest; -

我们说的是同一件事吗？：D

@yonel

thank's, course is in degree:-(
but i've not understand your algo, reading on apple doc i've found this:

Thus, north is 0 degrees, east is 90degrees, south is180 
degrees, and so on. Course values may not be available on all 
devices.

for me this mean

course between 0 and 44= North;
course between 45 and 89= NE; 
course between 90 and 134= East; 
course between 135 and 179= SouthEast;
course between 180 and 234= South;
course between 235 and 269= SouthWest;
course between 270 and 314= West;
course between 315 and 360 = NorthWest; -

Are we saying the same thing? :D

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