2014/10/15 下午 10:08:42

iphone Programming Glossary: extreme

What is the optimal way to monitor changes in a directory with a kqueue()?

http://stackoverflow.com/questions/2972563/what-is-the-optimal-way-to-monitor-changes-in-a-directory-with-a-kqueue

A loop checking if the new file's modification time is not changing might work but only most of the time. In some extreme circumstances iOS can pause to do all kinds of time consuming work of its own in the background. If there is a way to check..

Practical rules for premature optimization [closed]

http://stackoverflow.com/questions/2978460/practical-rules-for-premature-optimization

is optimizing the code before you have profiled it to find out where the performance bottleneck is. An even more extreme example of premature optimization is optimizing before you have run your program and established that it is running too..

send message to multiple objects at once (objective-c)

http://stackoverflow.com/questions/3158629/send-message-to-multiple-objects-at-once-objective-c

c object messaging share improve this question In short no neither Objective C nor C support this feature. As an extreme measure you can use NSArray makeObjectsPerformSelector and NSArray makeObjectsPerformSelector withObject such as NSArray..

UIButton block equivalent to addTarget:action:forControlEvents: method?

http://stackoverflow.com/questions/3908003/uibutton-block-equivalent-to-addtargetactionforcontrolevents-method

I suppose this could be implemented using a category but would rather not write this myself due to extreme laziness Something like this would be awesome button handleControlEvent UIControlEventTouchUpInside withBlock ^ NSLog @..

What determines the presence of the iPhone Location Services icon in the status bar?

http://stackoverflow.com/questions/4413963/what-determines-the-presence-of-the-iphone-location-services-icon-in-the-status

the worst case possible and it made me doubt my use of CLLocationManager . I would elaborate on my use but as an extreme case I tried removing the CoreLocation framework and the MapKit framework which I suspect also uses CoreLocation and all..

What is the range of bluetooth and is it strictly 1:1?

http://stackoverflow.com/questions/658899/what-is-the-range-of-bluetooth-and-is-it-strictly-11

practice you can hear this in the audio being carried . So in this case the range is about one meter. At the opposite extreme two class 2 devices separated by nothing more than clear air can get ranges of hundreds of meters. Other factors that influence..

Most efficient way to draw part of an image in iOS

http://stackoverflow.com/questions/8035673/most-efficient-way-to-draw-part-of-an-image-in-ios

context 1.0 1.0 CGContextDrawImage context rect imageRef CGImageRelease imageRef Unfortunately this seems extremely slow with medium sized images and a high setNeedsDisplay frequency. Playing with UIImageView 's frame and clipToBounds.. because it can get full acceleration of underlying OpenGL which means GPU acceleration . Anyway if you need extreme optimization for hundreds of animated sprites with finely tuned pixel shaders like in a game app you should use OpenGL directly..

Picker View not appearing on 1st attempt of button click

http://stackoverflow.com/questions/8617164/picker-view-not-appearing-on-1st-attempt-of-button-click

View not appearing on 1st attempt of button click I have a button on the extreme right of the cell. Now I have a picker view which needs to be displayed on button click. Its working fine with the following..