2014/10/15 下午 10:08:27

iphone Programming Glossary: equation

How to add operator signs '+,-,/,*,mod' etc to a label for making a calculator?

http://stackoverflow.com/questions/10794496/how-to-add-operator-signs-mod-etc-to-a-label-for-making-a-calculator

this question Sorry if I misunderstand your question but what you want is to display on your calculator app the full equation that you've input thus far e.g. 63 42 62 . Like any other calculator you should have 2 label one for your current input..

becomeFirstResponder Doesn't respect Keyboard settings

http://stackoverflow.com/questions/1214311/becomefirstresponder-doesnt-respect-keyboard-settings

Doesn't respect Keyboard settings I'm working on a fairly simple iPhone app to solve the quadratic equation mostly because it's so easy at least the concepts and math I've created an interface in Interface Builder that has a couple..

NSString to equation

http://stackoverflow.com/questions/1501949/nsstring-to-equation

to equation I am using Objective C and I am trying to set an equation that is stored in an NSString to be evaluated and stored in an.. to equation I am using Objective C and I am trying to set an equation that is stored in an NSString to be evaluated and stored in an NSInteger . something similar to the following equation NSString.. equation that is stored in an NSString to be evaluated and stored in an NSInteger . something similar to the following equation NSString alloc initWithString @ 1 5 6 and then evaluate that to become 31 and store it into an NSInteger . any ideas how..

distance between android and iphone

http://stackoverflow.com/questions/20730115/distance-between-android-and-iphone

Detecting Acceleration in a car (iPhone Accelerometer)

http://stackoverflow.com/questions/2733249/detecting-acceleration-in-a-car-iphone-accelerometer

was oriented directly upright because of gravity. Some trigonometry later and I had managed to work gravity out of the equation so that the car was actually being read very very well by the iPhone. Until I hit a slope. As soon as the angle of the car..

Drawing formulas with Quartz 2d

http://stackoverflow.com/questions/2907045/drawing-formulas-with-quartz-2d

improve this question As the developer of an iPhone application which does just that trust me when I say typesetting equations is not a trivial undertaking. In my case I used Core Animation layers to construct the sub elements of a parsed equation... is not a trivial undertaking. In my case I used Core Animation layers to construct the sub elements of a parsed equation. The equations are constructed hierarchically and the operations that compose them are laid out as such. Each operation.. a trivial undertaking. In my case I used Core Animation layers to construct the sub elements of a parsed equation. The equations are constructed hierarchically and the operations that compose them are laid out as such. Each operation is contained within..

Determining the magnitude of a certain frequency on the iPhone

http://stackoverflow.com/questions/2921674/determining-the-magnitude-of-a-certain-frequency-on-the-iphone

you can just calculate one output sample of the DFT and achieve O N performance. This can be done by looking at the equation for the DFT on the wikipedia page I'm not even going to try to type it here and just calculate Xk for a single k corresponding..

Parsing XML code on iphone SDK

http://stackoverflow.com/questions/3616447/parsing-xml-code-on-iphone-sdk

Usually with different sections you use different arrays for the data. This takes your theRow variable out of the equation. Here is a simple tutorial that stores the array's in a dictionary. And here is one that uses multiple arrays without a..

Find the tangent of a point on a cubic bezier curve (on an iPhone)

http://stackoverflow.com/questions/4089443/find-the-tangent-of-a-point-on-a-cubic-bezier-curve-on-an-iphone

iphone ipad bezier share improve this question The tangent of a curve is simply its derivative. The parametric equation that Michal uses P t 1 t ^3 P0 3t 1 t ^2 P1 3t^2 1 t P2 t^3 P3 should have a derivative of dP t dt 3 1 t ^2 P0 3 1 t ^2..

iPhone Compass GPS Direction

http://stackoverflow.com/questions/4130821/iphone-compass-gps-direction

^ iphone gps location compass geolocation share improve this question There is a standard heading or bearing equation that you can use if you are at lat1 lon1 and the point you are interested in is at lat2 lon2 then the equation is heading.. bearing equation that you can use if you are at lat1 lon1 and the point you are interested in is at lat2 lon2 then the equation is heading atan2 sin lon2 lon1 cos lat2 cos lat1 sin lat2 sin lat1 cos lat2 cos lon2 lon1 This gives you a bearing in radians..

Determining Image Luminance/Brightness

http://stackoverflow.com/questions/4876315/determining-image-luminance-brightness

has CvtColor . If you don't have such a framework handy but have access to the pixel intensities you can use the equation Y' 0.299 R 0.587 G 0.144 B to get the luma channel and then calculate the average. R G and B represent the red green and..

Making use of velocityInView with UIPanGestureRecognizer

http://stackoverflow.com/questions/9093544/making-use-of-velocityinview-with-uipangesturerecognizer

a bit more useful. I've tried a few things but cant quite figure out how to properly implement velocity changedLevel equation. void panDetected UIPanGestureRecognizer gesture CGPoint swipeLocation gesture locationInView self.tableView NSIndexPath..