Question

I try to get NSDate objects from NSString which I get from sqlite, but there is a time problem. I takes me 130ms every time. And it’s insufferable for i have two hundred objects to deal with. So can somebody tell me what i should do. Thanks.

Answer 1

Assuming you’re using NSDateFormatter, you should attend to Apple’s recommendation, caching formatters for efficiency. Instead of creating a NSDateFormatter each time you want to convert a date, you should keep a single instance of your NSDateFormatter. From Data Formatting guide:

Cache Formatters for Efficiency

Creating a date formatter is not a cheap operation. If you are likely
to use a formatter frequently, it is typically more efficient to cache
a single instance than to create and dispose of multiple instances.
One approach is to use a static variable.