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传感器组件 · App Inventor 2 中文网
...度（使用 由地址求经度 方法）。
中文网注：如果获取不了经纬度，请尝试开启一下定位权限，参考代码如下：
为了发挥作用，组件必须将其 启用 属性设置为真，并且设备必须通过无线网络启用定位感应器 或 GPS 卫星（如...
Label points in geom_point
...t.color = 'grey50') +
theme_classic()
### geom_text_repel
# only label players with PTS > 25 or < 18
# align text vertically with nudge_y and allow the labels to
# move horizontally with direction = "x"
ggplot(nba, aes(x= MIN, y = PTS, label = Name)) +
geom_point(color = dplyr::case_wh...
Converting NSString to NSDate (and back again)
...rmat contained in the string, use NSDataDetector for parsing date.
//Role players.
NSString *dateString = @"Wed, 03 Jul 2013 02:16:02 -0700";
__block NSDate *detectedDate;
//Detect.
NSDataDetector *detector = [NSDataDetector dataDetectorWithTypes:NSTextCheckingAllTypes error:nil];
[detector enumer...
UIView frame, bounds and center
...em of the view's bounds is within the view itself. (court=view, basketball/players=content inside the view)
Like the frame, view.center is also in the coordinates of the superview.
Frame vs Bounds - Example 1
The yellow rectangle represents the view's frame. The green rectangle represents the vie...
Encapsulation vs Abstraction?
...ile phone, you see their different types of functionalities as camera, mp3 player, calling function, recording function, multimedia etc. It is abstraction, because you are seeing only relevant information instead of their internal engineering.
abstract class MobilePhone
{
public void C...
Graph visualization library in JavaScript
...tionScript library for creating visualizations that run in the Adobe Flash Player, abandoned since 2012.
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转型产品经理必看 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...就更谈不上用户体验了。有问题不是坏事，可怕的是发现不了问题，发现问题后我开始解决问题，于是，我逐渐进入第二阶段。
阶段二：功能思维
发现工程思维下的产品工作不尽如人意，于是我开始有意识的思考，如何去分...
Android onCreate or onStartCommand for starting service
... will be called. and you can pass any action to perform . like for a music player , You can play ,pause,stop using action
And you do any operation in service by sending an action and receiving it on onStartCommand
onCreate work like a Constructor.
Edit in Short
onCreate() calls only for the fir...
How to force use of overflow menu on devices with menu button
...wered Dec 26 '13 at 6:46
a fair playera fair player
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When is std::weak_ptr useful?
...sed. Unless there is a loop... You may have several teams sharing the same player (past teams ?). If the team object "owns" the members, then there is no need to use a shared_ptr to begin with.
– Offirmo
Mar 16 '14 at 9:53
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