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How can i tell if an object has a key value observer attached
...SMutableArray like this:
- (void)addObservedObject:(id)object {
if (![_observedObjects containsObject:object]) {
[_observedObjects addObject:object];
}
}
If you want to unobserve the objects you can do something like:
for (id object in _observedObjects) {
if ([object isKindOf...
How to set Java environment path in Ubuntu
...le /etc/profile
sudo gedit /etc/profile
Add following lines in end
JAVA_HOME=/usr/lib/jvm/jdk1.7.0
PATH=$PATH:$HOME/bin:$JAVA_HOME/bin
export JAVA_HOME
export JRE_HOME
export PATH
Then Log out and Log in ubuntu for setting up the paths...
...
How to play a local video with Swift?
...
class ViewController: UIViewController {
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
playVideo()
}
private func playVideo() {
guard let path = Bundle.main.path(forResource: "video", ofType:"m4v") else {
debugPrint("...
Restore the state of std::cout after manipulating it
...lude <iostream> or #include <ios> then when required:
std::ios_base::fmtflags f( cout.flags() );
//Your code here...
cout.flags( f );
You can put these at the beginning and end of your function, or check out this answer on how to use this with RAII.
...
How to increase the vertical split window size in Vim
... :winc = This will also make them equal.
– nitin_cherian
Nov 13 '13 at 5:29
2
...
_csv.Error: field larger than field limit (131072)
...
The csv file might contain very huge fields, therefore increase the field_size_limit:
import sys
import csv
csv.field_size_limit(sys.maxsize)
sys.maxsize works for Python 2.x and 3.x. sys.maxint would only work with Python 2.x (SO: what-is-sys-maxint-in-python-3)
Update
As Geoff pointed out,...
CSS hack大全 - 创意 - 清泛网 - 专注C/C++及内核技术
...0deff\9; /*IE6、7、8识别*/ +background-color:#a200ff;/*IE6、7识别*/ _background-color:#1e0bd1/*IE6识别*/}
@media screen and (-webkit-min-device-pixel-ratio:0){.bb{background-color:#f1ee18}}{} /* Safari(Chrome) 有效 */
@media all and (min-width: 0px){ .bb{background-color:#f1ee18;/*op...
How to customize the background/border colors of a grouped table view cell?
...kgroundView.h
//
// Created by Mike Akers on 11/21/08.
// Copyright 2008 __MyCompanyName__. All rights reserved.
//
#import <UIKit/UIKit.h>
typedef enum {
CustomCellBackgroundViewPositionTop,
CustomCellBackgroundViewPositionMiddle,
CustomCellBackgroundViewPositionBottom,
...
Cross-browser testing: All major browsers on ONE machine
...Safari on a single Windows machine.
Download: http://sandboxie.com/index.php?DownloadSandboxie
Patch: The extended version is required to enable multiple sandboxes at a time. Pay them or visit YouTube.
Running multiple IE/Safari versions simultaneously requires the extended version. If you don't m...
Unique BooleanField value in Django?
...rn it off).
class Character(models.Model):
name = models.CharField(max_length=255)
is_the_chosen_one = models.BooleanField()
def save(self, *args, **kwargs):
if self.is_the_chosen_one:
try:
temp = Character.objects.get(is_the_chosen_one=True)
...