大约有 833 项符合查询结果（耗时：0.0329秒） [XML]
How to perform Callbacks in Objective-C
...
To keep this question up-to-date, iOS 5.0's introduction of ARC means this can be achieved using Blocks even more concisely:
@interface Robot: NSObject
+ (void)sayHi:(void(^)(NSString *))callback;
@end
@implementation Robot
+ (void)sayHi:(void(^)(NSString *))ca...
Why does an image captured using camera intent gets rotated on some devices on Android?
... it on Android Android 4.1 (Jelly Bean), Android 4.4 (KitKat) and Android 5.0 (Lollipop).
Steps
Scale down the image if it was bigger than 1024x1024.
Rotate the image to the right orientation only if it was rotate 90, 180 or 270 degree.
Recycle the rotated image for memory purposes.
Here is th...
An async/await example that causes a deadlock
...synchronous programming using c#'s async / await keywords (I'm new to c# 5.0).
5 Answers
...
Difference between classification and clustering in data mining? [closed]
...’s height is, there would be a lot of answers because the heights can be 5.0, 5.01, 5.011, etc. But a simple classification like types of light sabers (red,blue.green) would have very limited answers. Infact they can be represented with simple numbers. Red can be 0 , Blue can be 1 and Green can b...
Null vs. False vs. 0 in PHP
...doesn't exist in the database or is unknown. See dev.mysql.com/doc/refman/5.0/en/working-with-null.html or en.wikipedia.org/wiki/Null_%28SQL%29.
– Eli
Dec 5 '12 at 3:39
2
...
Python function overloading
...= Vector(1,1,1)
>>> speed = 100 #km/h
>>> acceleration = 5.0 #m/s
>>> script = lambda sprite: sprite.x * 2
>>> curve = Curve(3, 1, 4)
>>> headto = Point(100, 100) # somewhere far away
>>> add_bullet(sprite, start, direction, speed)
Called Versio...
How do you create an asynchronous method in C#?
...5C35.8209 11.5455 35.4954 10.8521 35.4954 9.60062V6.59049C35.4954 5.28821 35.0173 4.66232 34.0034 4.66232C32.9703 4.66232 32.492 5.28821 32.492 6.59049V10.1419Z\" /\u003e\u003cpath fill-rule=\"evenodd\" clip-rule=\"evenodd\" d=\"M25.6622 17.6335C27.8049 17.6335 29.3739 16.9402 30.2537 15.6379C30.846...
Immutable vs Mutable types
...
What? Floats are immutable? But can't I do
x = 5.0
x += 7.0
print x # 12.0
Doesn't that "mut" x?
Well you agree strings are immutable right? But you can do the same thing.
s = 'foo'
s += 'bar'
print s # foobar
The value of the variable changes, but it changes by cha...
UTF-8: General? Bin? Unicode?
...risons between characters.
Quoted from:
http://dev.mysql.com/doc/refman/5.0/en/charset-unicode-sets.html
For more detailed explanation, please read the following post from MySQL forums:
http://forums.mysql.com/read.php?103,187048,188748
As for utf8_bin:
Both utf8_general_ci and utf8_unicode_ci ...
How to get root access on Android emulator?
...b=adb -s emulator-5558 and set arch=x64. If you run Android above or equal 5.0, change set pie= to set pie=.pie. Run it. You get temporary root for current run.
If you got error on remount system partition then you need start AVD from command line. See below first step for Android 7.
If you want m...