ios 系统相关

 

 

判断当前设备 是否ipad

 

#define isIPad  UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad

 

 

 

 

剪贴板

得到剪贴板

UIPasteboard *pasteboard=[UIPasteboard generalPasteboard];

把一个字符串放置到剪贴板上： //用户此后在输入框 粘贴的就是这个字符串

pasteboard.string = @"Hello World";

从剪贴板获取字符串：

UIPasteboard *pasteboard=[UIPasteboard generalPasteboard];  

NSString *myString=pasteboard.string; 

 

 

 

在iphone模拟器截屏

打开模拟器 按住ctrl键打开编辑菜单，里面会有拷贝屏幕这一项，

然后打开预览 文件-》从夹纸板新建

添加静态库

把***.a文件拖到项目的framework里面

把头文件路径添加到header search path里

拿到app的documents路径

NSString *appDocDir = [[[[NSFileManagerdefaultManager] URLsForDirectory:NSDocumentDirectoryinDomains:NSUserDomainMask] lastObject] relativePath];

另一种写法
    NSString *appDocDir = [[[[NSFileManagerdefaultManager] URLsForDirectory:NSDocumentDirectoryinDomains:NSUserDomainMask] lastObject] relativePath];

    NSArray *contentOfFolder = [[NSFileManagerdefaultManager] contentsOfDirectoryAtPath:appDocDir error:NULL];
    for (NSString *aPath in contentOfFolder) {
        NSLog(@"apath: %@", aPath);
        NSString * fullPath = [appDocDir stringByAppendingPathComponent:aPath];
        BOOL isDir;
        if ([[NSFileManagerdefaultManager] fileExistsAtPath:fullPath isDirectory:&isDir] && !isDir)
        {
            [fileList addObject:aPath];
        }
    }

      NSURL *home = [[[NSFileManagerdefaultManager] URLsForDirectory:NSDocumentDirectoryinDomains:NSUserDomainMask] lastObject];

    NSURL *imaurl = [NSURLURLWithString:@"img2.jpg"relativeToURL:home];

 

让app支持itunes传文件

Add the UIFileSharingEnabled key to your application’s Info.plist file and set the value of the key to YES

判读当前是否横向

if (UIInterfaceOrientationIsLandscape([UIDevice currentDevice].orientation)) {

如果你的程序中用到了WiFi，想在没有有效WiFi的时候出现如图所示的提示该怎么做？

UIRequiresPersistentWiFi Boolean true

图标不要光环

UIPrerenderedIcon YES

免费程序中链接你的收费app

To send customers to a specific application: http://itunes.com/apps/appname

To send customers to a list of apps you have on the App Store:http://itunes.com/apps/developername

To send customers to a specific app with your company name included in the URL:http://itunes.com/apps/developername/appname

A tip is to use itms:// instead of http://, then it'll open in the app store directly. On the iPhone, it will make 2 (!) redirects when using http, and 1 when using itms.

White space in app name should just be removed

http://developer.apple.com/library/ios/#qa/qa1633/_index.html

代码中调用safari 可实现跳转到app store!

    NSURL *requestURL = [NSURLURLWithString:@"http://www.163.com"];

    [[UIApplicationsharedApplication] openURL:requestURL];

关闭后台运行  

 iOS 4引进了所谓多任务，可以让程序运行于后台，不过对目前大部分程序而言这只是一个鸡肋。有没有办法直接在用户按下Home键后像iOS 4之前的程序一样直接退出呢？方法如下：

1. 打开info.plist
2. 加入 UIApplicationExitsOnSuspend 或者选择“Application does not run in background（程序不运行于后台）”
3. 将其设为 YES

sadasd