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App Inventor 2 屏幕管理与多屏幕教程 · App Inventor 2 中文网
...代码中控制流程
when Screen1.Initialize {
// 检查是否已登录
var 已登录 = 微数据库1.GetValue("logged_in", false)
if 已登录 {
openAnotherScreen("Screen_Home")
} else {
openAnotherScreen("Screen_Login")
}
}
方法三：第一个Screen...
What is http multipart request?
I have been writing iPhone applications for some time now, sending data to server, receiving data (via HTTP protocol), without thinking too much about it. Mostly I am theoretically familiar with process, but the part I am not so familiar is HTTP multipart request. I know its basic structure, but the...
网站伪静态Rewrite重写中文路径时乱码 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...，有时使用360乱码在ff浏览器所有搜索引擎都没问题了，为了解决这个问题下面我们来总结一下我的分析过程。转自：http://www.111cn.net/sys/Windows/55779.htm
一、问题的由来。
URL就是网址，只要上网，就一定会用到。
一般来说，UR...
Xcode - How to fix 'NSUnknownKeyException', reason: … this class is not key value coding-compliant f
...
I had to delete the app from the simulator/iPhone to get rid of this error.
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When to use enumerateObjectsUsingBlock vs. for
... I confirm enumerateObjectsUsingBlock: is still 4X slower on real iPhone 6 iOS9, using Xcode 7.x to build.
– Cœur
Nov 25 '15 at 12:56
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Calculate distance between two latitude-longitude points? (Haversine formula)
...Thanks very much for all this. I used the following code in my Objective-C iPhone app:
const double PIx = 3.141592653589793;
const double RADIO = 6371; // Mean radius of Earth in Km
double convertToRadians(double val) {
return val * PIx / 180;
}
-(double)kilometresBetweenPlace1:(CLLocationC...
FAT32文件系统格式详解 - C/C++ - 清泛网 - 专注C/C++及内核技术
...的增强，由于文件系统的核心--文件分配表FAT由16位扩充为32位，所以称为FAT32文件系统。在一逻辑盘（硬盘的一分区）超过 512 兆字节时使用这种格式，会更高效地存储数据，减少硬盘空间的浪费，一般还会使程序运行加快，使...
UIView Infinite 360 degree rotation animation?
...
Found a method (I modified it a bit) that worked perfectly for me: iphone UIImageView rotation
#import <QuartzCore/QuartzCore.h>
- (void) runSpinAnimationOnView:(UIView*)view duration:(CGFloat)duration rotations:(CGFloat)rotations repeat:(float)repeat {
CABasicAnimation* rotation...
Create UIActionSheet 'otherButtons' by passing in array, not varlist
...
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UIPopovercontroller dealloc reached while popover is still visible
...it is managed by the presentation controller.
Code example (works both on iPhone and iPad):
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
picker.sourceType = UIImagePickerControllerSourceTypeCamera;
picker.allowsEditing = YES;
picker.modalPresent...