判斷字符串是否是合法的郵箱地址
-(BOOL) NSStringIsValidEmail:(NSString *)checkString
{
BOOL stricterFilter = YES; // Discussion http://blog.logichigh.com/2010/09/02/validating-an-e-mail-address/
NSString *stricterFilterString = @"[A-Z0-9a-z\\._%+-]+@([A-Za-z0-9-]+\\.)+[A-Za-z]{2,4}";
NSString *laxString = @".+@([A-Za-z0-9]+\\.)+[A-Za-z]{2}[A-Za-z]*";
NSString *emailRegex = stricterFilter ? stricterFilterString : laxString;
NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
return [emailTest evaluateWithObject:checkString];
}計算兩個日期之間相差幾天幾小時幾分鐘
用timeIntervalSinceDate得到日期之間相差的秒數，然後再轉換成天數小時和分
NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDateComponents *comps = [[NSDateComponents alloc] init];
NSInteger unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSWeekdayCalendarUnit |
NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
comps=[calendar components:unitFlags fromDate:date toDate:date options:0];
NSLog(@"%@",comps);
// comps = [calendar components:unitFlags fromDate:date];NSDateFormatter *dateFormatter=[[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSDate * senddate=[NSDate date];
//結束時間
NSDate *endDate = [dateFormatter dateFromString:@"2014-6-24 00:00:00"];
//當前時間
NSDate *senderDate = [dateFormatter dateFromString:[dateFormatter stringFromDate:senddate]];
//得到相差秒數
NSTimeInterval time=[endDate timeIntervalSinceDate:senderDate];
int days = ((int)time)/(3600*24);
int hours = ((int)time)%(3600*24)/3600;
int minute = ((int)time)%(3600*24)600/60;
if (days <= 0&&hours; <= 0&&minute; <= 0)
dateContent=@"0天0小時0分鐘";
else
dateContent=[[NSString alloc] initWithFormat:@"%i天%i小時%i分鐘",days,hours,minute];刷新某行cell的方法
NSIndexPath *indexPath_1=[NSIndexPath indexPathForRow:indePath.row inSection:0];
NSArray *indexArray=[NSArray arrayWithObject:indexPath_1];
[myTableView reloadRowsAtIndexPaths:indexArray withRowAnimation:UITableViewRowAnimationAutomatic];iOS7上tableView的分割線左邊短了一點
ios7裏面tableViewCell上面的分割線，左邊少了20個像素，用下面的方法，可以讓分割線完整顯示出來
if ([_tableView respondsToSelector:@selector(setSeparatorInset:)]) {
[_tableView setSeparatorInset:UIEdgeInsetsZero];
}改變狀態欄字體顏色
1.在info.plist裏面添加字段
key－－－－View controller-based status bar appearance
value－－－NO
在appDelegate裏面添加代碼：
[[UIApplication sharedApplication] setStatusBarHidden:NO withAnimation:UIStatusBarAnimationFade];
[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleLightContent animated:YES];如何讓textField輸入框 限制輸入字數的同時，還只讓輸入數字和字母
//UITextFieldDelegate
- (BOOL)textFieldShouldReturn:(UITextField *)textField;
{
//用戶結束輸入
[textField resignFirstResponder];
return YES;
}
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string // return NO to not change text
{
//判斷是否超過 ACCOUNT_MAX_CHARS 個字符,注意要判斷當string.leng>0
//的情況纔行，如果是刪除的時候，string.length==0
int length = textField.text.length;
if (length >= ACCOUNT_MAX_CHARS && string.length >0)
{
return NO;
}
NSCharacterSet *cs;
cs = [[NSCharacterSet characterSetWithCharactersInString:kAlphaNum] invertedSet];
NSString *filtered =
[[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""];
BOOL basic = [string isEqualToString:filtered];
return basic;
}？企業版ipa安裝方法
訪問my.html，通過itms-services協議跳轉到my.plist實現下載安裝my.ipa
相關my.ipa設置需修改my.plist文件
相關my.ipa設置需修改my.plist文件
/*網頁部分 "my.html"*/
<!DOCTYPE html PUBLIC "-//WAPFORUM//DTD XHTML Mobile 1.0//EN" "http://www.wapforum.org/DTD/xhtml-mobile10.dtd" >
<html>
<head>
<title>安裝我的應用</title>
</head>
<body>
<a href='itms-services://?action=download-manifest&url=http://192.168.1.123:8080/ipa.plist'>安裝我的應用</a>
</body>
</html><?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>items</key>
<array>
<dict>
<key>assets</key>
<array>
<dict>
<key>kind</key>
<string>software-package</string>
<key>url</key>
<string>http://192.168.1.123:8080/ipa/my.ipa</string>
</dict>
<dict>
<key>kind</key>
<string>display-image</string>
<key>needs-shine</key>
<true/>
<key>url</key>
<string>http://192.168.1.123/ipa/icon_120.png</string>
</dict>
<dict>
<key>kind</key>
<string>full-size-image</string>
<key>needs-shine</key>
<true/>
<key>url</key>
<string>http://192.168.1.123:8080/ipa/icon_120.png</string>
</dict>
</array><key>metadata</key>
<dict>
<key>bundle-identifier</key>
<string>com.my.myapp</string>
<key>bundle-version</key>
<string>1.0.0</string>
<key>kind</key>
<string>software</string>
<key>subtitle</key>
<string>我的應用</string>
<key>title</key>
<string>我的應用</string>
</dict>
</dict>
</array>
</dict>
</plist>