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Placeholder in UITextView
...uble.
UIPlaceHolderTextView.h:
#import <Foundation/Foundation.h>
IB_DESIGNABLE
@interface UIPlaceHolderTextView : UITextView
@property (nonatomic, retain) IBInspectable NSString *placeholder;
@property (nonatomic, retain) IBInspectable UIColor *placeholderColor;
-(void)textChanged:(NSNotif...
Is there any difference between “foo is None” and “foo == None”?
...pares the same object instance
Whereas == is ultimately determined by the __eq__() method
i.e.
>>> class Foo(object):
def __eq__(self, other):
return True
>>> f = Foo()
>>> f == None
True
>>> f is None
False
...
Avoiding memory leaks with Scalaz 7 zipWithIndex/group enumeratees
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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GET URL parameter in PHP
...
$_GET is not a function or language construct—it's just a variable (an array). Try:
<?php
echo $_GET['link'];
In particular, it's a superglobal: a built-in variable that's populated by PHP and is available in all scope...
How to avoid circular imports in Python? [duplicate]
...
Doesn't seem to work with submodules import foobar.mod_a and import foobar.mod_b doesn't work like described above.
– Nick
Oct 2 '13 at 0:39
...
history.replaceState() example?
...
For jquery users.. try $("title").html(_title);
– suraj jain
Sep 5 '16 at 13:11
...
How to convert string representation of list to a list?
...
Inspired from some of the answers above that work with base python packages I compared the performance of a few (using Python 3.7.3):
Method 1: ast
import ast
list(map(str.strip, ast.literal_eval(u'[ "A","B","C" , " D"]')))
# ['A', 'B', 'C', 'D']
import timeit
timeit.timeit(st...
MDI CDockablePane使用总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...架类的头文件中定义一个CDockablePane的数组
CDockablePane m_Panes[5];//一个CDockablePane的数组
2. CFrameWndEx:: OnCreate() 在Create函数中自动生成了以下代码，对MFC比较熟悉的这里就不讲了：
CMFCPopupMenu::SetForceMenuFocus(FALSE);
InitUserToolbars(N...
What is the difference between a static and a non-static initialization code block
...ll instance initialized with this construtor
}
public MyClass(int _myParam) {
if (_myParam > 0) {
myField = myField * 4;
//myField is worth 20 for all instance initialized with this construtor
//if _myParam is greater than 0
} else {
...
Best practice for Python assert
...essThanZeroException(Exception):
pass
class variable(object):
def __init__(self, value=0):
self.__x = value
def __set__(self, obj, value):
if value < 0:
raise LessThanZeroException('x is less than zero')
self.__x = value
def __get__(self, o...