iphone

Objective C equivalent to javascripts setTimeout?

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The performSelector: family has its limitations. Here is the closest setTimeout equivalent: dispatch_time_t delay = dispatch_time(DISPATCH_TIME_NOW, NSEC_PER_SEC * 0.5); dispatch_after(delay, dispatch_get_main_queue(), ^(void){ // do work in the UI thread here }); EDIT: A couple of projects that provide syntactic sugar and the ability to cancel execution (clearTimeout): https://github.com/Spaceman-Labs/Dispatch-Cancel https://gist.github.com/zwaldowski/955123

Objective C defining UIColor constants

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A UIColor is not mutable. I usually do this with colors, fonts and images. You could easily modify it to use singletons or have a static initializer. @interface UIColor (MyProject) +(UIColor *) colorForSomePurpose; @end @implementation UIColor (MyProject) +(UIColor *) colorForSomePurpose { return [UIColor colorWithRed:0.6 green:0.8 blue:1.0 alpha:1.0]; } @end

urldecode in objective-c

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I made a quick category to help resolve this 🙂 @interface NSString (stringByDecodingURLFormat) – (NSString *)stringByDecodingURLFormat; @end @implementation NSString – (NSString *)stringByDecodingURLFormat { NSString *result = [(NSString *)self stringByReplacingOccurrencesOfString:@”+” withString:@” “]; result = [result stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; return result; } @end Once defined, this quickly can handle an encoded string: NSString *decodedString = [myString stringByDecodingURLFormat]; Plenty of … Read more

Core Data: Error, “Can’t Merge Models With Two Different Entities Named ‘foo’ “

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For those who come across this question after trying to use core data lightweight migrations: I was having this issue even after following the instructions for creating a new version of my data model. I noticed that there were two “.mom” files in my application bundle, one “.mom” and one “.momd” directory that contained “.mom” … Read more

How to view the data in sqlite file running in iphone application? [closed]

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If you want to view your database when running on Simulator it is located at the following location user/Library/Application Support/iPhone Simulator/version of SDK(4.2eg)/Applications/4AF938D6-E981-4971-A588-3424B64E7EE7(eg)/Documents/yourdatabase.sqlite If you want to view the database in your device then you can use a software like iExplorer. Cheers Edit : The location of sqlite file has changed. It currently resides in … Read more