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When to use enumerateObjectsUsingBlock vs. for
... I confirm enumerateObjectsUsingBlock: is still 4X slower on real iPhone 6 iOS9, using Xcode 7.x to build.
– Cœur
Nov 25 '15 at 12:56
...
Calculate distance between two latitude-longitude points? (Haversine formula)
...Thanks very much for all this. I used the following code in my Objective-C iPhone app:
const double PIx = 3.141592653589793;
const double RADIO = 6371; // Mean radius of Earth in Km
double convertToRadians(double val) {
return val * PIx / 180;
}
-(double)kilometresBetweenPlace1:(CLLocationC...
UIView Infinite 360 degree rotation animation?
...
Found a method (I modified it a bit) that worked perfectly for me: iphone UIImageView rotation
#import <QuartzCore/QuartzCore.h>
- (void) runSpinAnimationOnView:(UIView*)view duration:(CGFloat)duration rotations:(CGFloat)rotations repeat:(float)repeat {
CABasicAnimation* rotation...
Create UIActionSheet 'otherButtons' by passing in array, not varlist
...
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UIPopovercontroller dealloc reached while popover is still visible
...it is managed by the presentation controller.
Code example (works both on iPhone and iPad):
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.sourceType = UIImagePickerControllerSourceTypeCamera;
picker.allowsEditing = YES;
picker.modalPresent...
Is there a way to iterate over a dictionary?
...e if you're targeting Mac OS X pre-10.5, but you can still use on 10.5 and iPhone) is to use an NSEnumerator:
NSEnumerator *enumerator = [myDict keyEnumerator];
id key;
// extra parens to suppress warning about using = instead of ==
while((key = [enumerator nextObject]))
NSLog(@"key=%@ value=%@...
navigator.geolocation.getCurrentPosition sometimes works sometimes doesn't
...e, dev and canary) just not in FF and Safari. It also works perfect on my iPhone and iPad (Safari!). This might be due to the relative newness of this feature (i.e. it is a bug). I spend almost a week on this now and I just cannot get it to work on those browsers
Here's what I found:
The first ...
How to change checkbox's border style in CSS?
...Update Versions: 11.0.22])
Microsoft Edge (20.10240.16384.0)
Safari Mobile iPhone iOS9 (601.1.46)
label,
input[type="radio"] + span,
input[type="radio"] + span::before,
label,
input[type="checkbox"] + span,
input[type="checkbox"] + span::before
{
display: inline-block;
vertical...
How do I determine which iOS SDK I have?
... -sdk macosx10.9
iOS SDKs:
iOS 6.1 -sdk iphoneos6.1
iOS 7.0 -sdk iphoneos7.0
iOS Simulator SDKs:
Simulator - iOS 6.0 -sdk iphonesimulator6.0
Simulator - iOS 6.1 -sdk iphonesimulator6.1
Simulator - iOS...
UIView's frame, bounds, center, origin, when to use what?
...at context"...
frame - this is the property you most often use for normal iPhone applications. most controls will be laid out relative to the "containing" control so the frame.origin will directly correspond to where the control needs to display, and frame.size will determine how big to make the c...