經過一個寒假的學習，我對oc和ios開發有了一定的瞭解，也僥倖成爲了實驗室的一員，學長三週前佈置了一個任務，做一個添加考試的app（在此之前一直漫無目地的學習ios，幾乎沒有進步，但做完這個程序感覺學到了好多，所謂在項目中成長嘛）,在這裏總結一下我學到的東西：
1.首先大框架上是圍繞課程展開的，用面向對象來說課程就是一個類，展示課程要用到UITableView和cell，這便涉及到對象的封裝，cell的封裝，cell的重用，UITableViewDataSource和UITableViewDelegate協議方法，將對象放於數組內等等，之前做個幾個類似的程序，所以還不算困難。
2.點擊“添加考試”按鈕彈出添加界面用到模態窗口，這個也用過多次，還有就是要將數據傳回主界面創建cell，自定義協議，通過代理傳數據，被傳遞的控制器當做代理。
3.點擊cell進入一個詳情界面，顯示出課程各個內容，然後在詳情界面還有編輯按鈕，點擊進入編輯界面，這裏我沒有重新創建新的控制器，還是用創建界面那個控制器，但這會出現一個問題，創建課程和修改課程都需要向其他控制器傳遞數據，所以在編輯完或者創建完傳數據時需要判斷代理的類，如果代理是ViewController調用對應的代理方法，如果代理是DetailViewController調用對應代理方法。
4.時間選擇器UIDatePicker
有這麼幾種形式的時間UIDatePickerModeDate、UIDatePickerModeTime、UIDatePickerModeDateAndTime
#pragma 添加日期選擇器
- (void)addDatePicker
{
_datePicker = [[UIDatePicker alloc] init];
_datePicker.datePickerMode = UIDatePickerModeDateAndTime;
_datePicker.backgroundColor = [UIColor whiteColor];
[_datePicker addTarget:self action:@selector(chooseDate:) forControlEvents:UIControlEventValueChanged];
}
//設置日期格式
- (void)chooseDate:(UIDatePicker *)sender {
NSDate *selectedDate = sender.date;
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
formatter.dateFormat = @"yyyy-MM-dd-HH";
NSString *dateString = [formatter stringFromDate:selectedDate];
_time.text = dateString;
}
//設置鍵盤和日期選擇器的彈出邏輯
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
//如果當前要顯示的鍵盤，那麼把UIDatePicker（如果在視圖中）隱藏
if (textField.tag != 1001) {
if (_datePicker.superview) {
[_datePicker removeFromSuperview];
} return YES;
}
//UIDatePicker以及在當前視圖上就不用再顯示了
if (_datePicker.superview == nil) {
//close all keyboard or data picker visible currently
[_name resignFirstResponder];
[_place resignFirstResponder];
[_other resignFirstResponder];
//此處將Y座標設在最底下，爲了一會動畫的展示
_datePicker.frame = CGRectMake(0, 480, 320, 216);
[self.view addSubview:_datePicker];
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.3f];
[UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
_datePicker.frame = CGRectMake(0, 270, 320, 216);
[UIView commitAnimations];
}
return NO;
}5.鍵盤遮擋TextField問題
<span style="font-size:14px;">//監聽鍵盤彈出
- (void)registerForKeyboardNotifications
{
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWasShown:)
name:UIKeyboardDidShowNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(keyboardWasHidden:)
name:UIKeyboardDidHideNotification object:nil];
}
//鍵盤彈出時調用
- (void)keyboardWasShown:(NSNotification *)aNotification
{
if (keyboardShown) return;
if( _activeField == _other || _activeField == _place)
{
[_scrollView setContentOffset:CGPointMake(0.0, _activeField.frame.origin.y - 90) animated:YES];
keyboardShown = YES;
}
}
//鍵盤隱藏時調用
- (void)keyboardWasHidden:(NSNotification*)aNotification
{//獲取鍵盤size NSDictionary* info = [aNotification userInfo]; NSValue* aValue = [info objectForKey:@"UIKeyboardBoundsUserInfoKey"];
CGSize keyboardSize = [aValue CGRectValue].size;
if (_activeField == _place) {
[_scrollView setContentOffset:CGPointMake(0.0, _activeField.frame.origin.y-200) animated:YES];
keyboardShown = NO;
}
if (_activeField == _other) {
[_scrollView setContentOffset:CGPointMake(0.0, _activeField.frame.origin.y-keyboardSize.height) animated:YES];
keyboardShown = NO;
}
}
//跟蹤活動文本框的方法
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
_activeField = textField;
}
- (void)textFieldDidEndEditing:(UITextField *)textField
{
_activeField = nil;
}
//點擊鍵盤return按鈕鍵盤隱藏
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
if (_activeField == _place) {
[_scrollView setContentOffset:CGPointMake(0.0, _activeField.frame.origin.y-200) animated:YES];
keyboardShown = NO;
}
if (_activeField == _other) {
[_scrollView setContentOffset:CGPointMake(0.0, _activeField.frame.origin.y-253) animated:YES];
keyboardShown = NO;
}
[textField resignFirstResponder];
return YES;
}</span><span style="font-size: 18px;">
</span>6.文件操作
NSMutableDictionary *dic = [[NSMutableDictionary alloc] init];
[dic setObject:name forKey:@"name"];
[dic setObject:time forKey:@"time"];
[dic setObject:place forKey:@"place"];
[dic setObject:other forKey:@"other"];
//將bool類型轉化成NSNumber類型寫入字典
NSNumber *aswitch = [NSNumber numberWithBool:isOn];
[dic setObject:aswitch forKey:@"aSwitch"];
[_dicCourse addObject:dic];
//獲取應用程序沙盒的Documents目錄
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
NSString *plistPath = [paths objectAtIndex:0];
//得到完整的文件名
NSString *filename = [plistPath stringByAppendingPathComponent:@"Course.plist"];
//輸入寫入<pre name="code" class="objc" style="font-size: 18px;">//_dicCourse是一個裝有課程對象字典的數組
- (void)readFile
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
NSString *plistPath = [paths objectAtIndex:0];
//得到完整的文件名
NSString *filename = [plistPath stringByAppendingPathComponent:@"Course.plist"];
//加載plist文件
NSArray *array = [NSArray arrayWithContentsOfFile:filename];//遍歷array數組
for (NSDictionary *dict in array) {
[_course addObject:[Course courseWithDict:dict]];
[_dicCourse addObject:dict];
}
}
7.長按刪除手勢
- (void)addGesture
{
UILongPressGestureRecognizer *lpgr = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLongPress:)];
lpgr.minimumPressDuration = 1.0; //seconds 設置響應時間
lpgr.delegate = self;
[_tableView addGestureRecognizer:lpgr];
}
- (void)handleLongPress:(UILongPressGestureRecognizer *)gestureRecognizer
{ //可以避免重複調用
if(gestureRecognizer.state == UIGestureRecognizerStateBegan)
{<span style="white-space:pre"> </span>//判斷點擊cell的位置
CGPoint p = [gestureRecognizer locationInView:_tableView ];
NSIndexPath *indexPath = [_tableView indexPathForRowAtPoint:p];
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"警告" message:@"是否刪除" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"確定 ", nil];
[alertView show];
index = indexPath.row;
}
}
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
if (buttonIndex == 1) {
[_course removeObjectAtIndex:index];
[_dicCourse removeObjectAtIndex:index];
//獲取應用程序沙盒的Documents目錄
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
NSString *plistPath = [paths objectAtIndex:0];
//得到完整的文件名
NSString *filename = [plistPath stringByAppendingPathComponent:@"Course.plist"];
//輸入寫入
[_dicCourse writeToFile:filename atomically:YES];
[self.tableView reloadData];
}
}
8.UIAlertView
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
9.日期格式和計算
NSDate *date = [[NSDate alloc] init];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd-HH"];
date = [dateFormatter dateFromString:cell.timeLabel.text];
double time = [date timeIntervalSinceNow];
int days = time/86400;
int hours = time/3600 - days*24;
小結：
早在寒假學長就鼓勵我們寫博客，說來實在慚愧，這期間一直沒有發現博客有這麼重要的作用，直到有一天閒來無事翻看龍澤學長的博客，發現與我與學長簡直天壤之別，感覺他的水平是我無法企及的。突然感到博客的重要性，一來總結自己的經驗，將來翻看要比直接項目方便的多；二來與網友分享自己遇到的問題的好的方法，共同進步；三來來記錄自己的學習經歷，將來萬一成了大神，也好講述自己學習的心路歷程，作爲炫耀的資本。(此條yy了一下0.0)。
第一次寫博客，沒有太多高深的見解，只是將學到的東西做個筆記，隨時翻看，加油！