大约有 7,000 项符合查询结果（耗时：0.0277秒） [XML]
Which is the preferred way to concatenate a string in Python?
...string. And this can be true, in some cases. Here, for example, is one
million appends of a one-character string, first to a string, then to a list:
a += b:
0.10780501365661621
a.append(b):
0.1123361587524414
OK, turns out that even when the resulting string is a million characters long, appendin...
Paperclip::Errors::MissingRequiredValidatorError with Rails 4
...en it says "MissingRequiredValidatorError"
I thought that by updating post_params and giving it :image it would be fine, as both create and update use post_params
...
How can I convert my device token (NSData) into an NSString?
I am implementing push notifications. I'd like to save my APNS Token as a String.
29 Answers
...
Get user profile picture by Id
I'm now working on a web application which is mostly based of facebook graph api.
I hold some data about users - actually , the possible public data available - such as name and id.
I also know that a profile picture is a part of the public data, and I wondered how I'll be able to get a direct link ...
CSS - Overflow: Scroll; - Always show vertical scroll bar?
...
Just ran into this problem myself. OSx Lion hides scrollbars while not in use to make it seem more "slick", but at the same time the issue you addressed comes up: people sometimes cannot see whether a div has a scroll feature or not.
The fix: In your css include ...
In Objective-C, how do I test the object type?
... Be careful with it though, as many Apple objects are actually Core Foundation types in disguise. (Eg. an NSString is more often an NSCFString, and isMemberOfClass: will return false for this comparison.)
– Craig Otis
Jul 17 '09 at 17:45
...
Querying DynamoDB by date
... in your table, and then checking if that row has a date that matches your parameters. This is really expensive, especially if you are in the business of storing events by date in the first place (i.e. you have a lot of rows.)
You may be tempted to put all the data in a single partition to solve t...
Container View Controller Examples [closed]
... Custom View Controller as a Container View Controller? The only documentation I can find is a couple of paragraphs in the UIViewController Class Reference . I feel I need a little more information than that and an example implementation would be nice. Google has turned up nothing at all.
...
Simulate limited bandwidth from within Chrome?
Is there a way I can simulate various connection speeds from within Chrome?
13 Answers
...
Understand convertRect:toView:, convertRect:FromView:, convertPoint:toView: and convertPoint:fromVie
I'm trying to understand the functionalities of these methods. Could you provide me a simple usecase to understand theirs semantics?
...