objective-c

问题 My Question is how can i find minimum and maximum latitude and longitude of specific area (500 meter) from current location. In my case, Such like i need to get X and Y CLLocation (latitude and longitude) from 500 meter of area See my image (sorry for this may be bad drawing ) I also have to tried to googling and i got link such like How can i get minimum and maximum latitude and longitude using current location and radius? But i don't know how it implement in my case. Pleas help me in this

问题 My Question is how can i find minimum and maximum latitude and longitude of specific area (500 meter) from current location. In my case, Such like i need to get X and Y CLLocation (latitude and longitude) from 500 meter of area See my image (sorry for this may be bad drawing ) I also have to tried to googling and i got link such like How can i get minimum and maximum latitude and longitude using current location and radius? But i don't know how it implement in my case. Pleas help me in this

问题 My Question is how can i find minimum and maximum latitude and longitude of specific area (500 meter) from current location. In my case, Such like i need to get X and Y CLLocation (latitude and longitude) from 500 meter of area See my image (sorry for this may be bad drawing ) I also have to tried to googling and i got link such like How can i get minimum and maximum latitude and longitude using current location and radius? But i don't know how it implement in my case. Pleas help me in this

问题 I'm facing a strange behavior with Cocoa NSView on Mac OS X. I've a custom NSView in a NSView container, this custom NSView tracks mouse movements, clicks, and has a tooltip. When I add a NSView above the described view, I can still see the tooltips even if the view with the tooltip is under, behind and not visible. I'm pretty sure that I misunderstood something in the event handling chain. Any help is really appreciated! 回答1: The core issue is that you are not supposed to have overlapping

问题 I'm facing a strange behavior with Cocoa NSView on Mac OS X. I've a custom NSView in a NSView container, this custom NSView tracks mouse movements, clicks, and has a tooltip. When I add a NSView above the described view, I can still see the tooltips even if the view with the tooltip is under, behind and not visible. I'm pretty sure that I misunderstood something in the event handling chain. Any help is really appreciated! 回答1: The core issue is that you are not supposed to have overlapping

问题 How can I make a call between three, four and more accounts using PJSIP API in iOS? To make a call between two account, I use pjsua_call_make_call function. char *destUri = "sip:account@example.com"; pj_status_t status; pj_str_t uri = pj_str(destUri); status = pjsua_call_make_call(_acc_id, &uri, 0, NULL, NULL, NULL); if (status != PJ_SUCCESS) error_exit("Error making call", status); 回答1: I have no experience to run PJSIP on iOS yet (may be there is some restrictions on call count in iOS

问题 How can I make a call between three, four and more accounts using PJSIP API in iOS? To make a call between two account, I use pjsua_call_make_call function. char *destUri = "sip:account@example.com"; pj_status_t status; pj_str_t uri = pj_str(destUri); status = pjsua_call_make_call(_acc_id, &uri, 0, NULL, NULL, NULL); if (status != PJ_SUCCESS) error_exit("Error making call", status); 回答1: I have no experience to run PJSIP on iOS yet (may be there is some restrictions on call count in iOS

问题 I am trying to get a byte array from an NSString in objective c using ascii encoding. I need to this array to calculate the SHA256 hash of that string and then compare the result to the SHA256 encoding generated in Windows. NSString *myString = @"123456¥"; const char *string = (const unsigned char *) [myString cStringUsingEncoding:NSASCIIStringEncodin]; this always gives nil since it contains the ¥ character. the problem is I cannot use UTF8Encoding since the hash generated by windows uses

问题 I've noticed iOS it's very mean when using UICollectionView inside an UITableViewCell . What I'm trying to achieve, it's to have a Collection of Images ( UICollectionView approach) inside a UITableViewCell . I'm trying to mimic Facebook post style, I think, they have an UITableView , with custom cells and so on, but here's the Problem... I've managed to put the UICollectionView inside an UITableViewCell , and It worked correctly and perfectly, no problem, everything showing fine, it's

问题 There are many answers to get cursor CGPoint within UITextView. But I need to find a position of cursor in relation to self.view (or phone screen borders). Is there a way to do so in Objective-C? 回答1: UIView has a convert(_:to:) method that does exactly that. It converts coordinates from the receiver coordinate space to another view coordinate space. Here is an example: Objective-C UITextView *textView = [[UITextView alloc] initWithFrame:CGRectZero]; UITextRange *selectedTextRange = textView