我有一个添加提醒的屏幕。屏幕有 2 个文本字段和 1 个文本视图。这些都在滚动视图下，它是 TPAvoidingScrollView 类的子类。这个类本身管理 scrollView 的位置，因此当键盘出现和消失时内部的组件。
画面如下。
在我浏览了所有字段并选择了某些值之后。通过单击添加提醒，事件被添加到主日历中，并且屏幕弹出到前一个屏幕。然后问题开始出现。一旦我再次来到这个屏幕并点击 Textview Notes，应用程序就会因这些错误而崩溃。
这里提醒视图控制器是类的名称整个类的代码是：
#import "ReminderViewController.h"
#import <EventKit/EventKit.h>
#import "ActionSheetPicker.h"
#import "NSDate-Utilities.h"
@interface ReminderViewController ()
@end
@implementation ReminderViewController
@synthesize scrollView;
@synthesize txt_notes;
@synthesize txt_remindOn;
@synthesize txt_repeatAlarm;
@synthesize btn_appointment;
@synthesize btn_pickup;
@synthesize btn_reminder;
@synthesize txt_currentFocussedTextField;
@synthesize selectedDate;
@synthesize arr_repeatAlarm;
@synthesize selectedIndex;
@synthesize isSelected;
@synthesize str_eventTitle;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
self.scrollView.contentSize = CGSizeMake(320, 520);
self.selectedDate = [NSDate date];
self.arr_repeatAlarm = [NSArray arrayWithObjects:@"None",@"Every Day", @"Every Week",
@"Every Month", @"Every year", nil];
btn_reminder.backgroundColor =[UIColor colorWithRed:0.0/255 green:89.0/255 blue:178.0/255
alpha:1.0f];
[[AppDelegate sharedInstance] setUpHighlightedStateOfButton:btn_reminder];
// Do any additional setup after loading the view.
}
#pragma mark - Check button click methods
-(IBAction)btn_appointment_click:(id)sender{
if(btn_appointment.selected){
[btn_appointment setSelected:NO];
[btn_pickup setSelected:YES];
isSelected = NO;
}
else{
[btn_appointment setSelected:YES];
[btn_pickup setSelected:NO];
isSelected = YES;
}
}
-(IBAction)btn_pickup_click:(id)sender{
if(btn_pickup.selected){
[btn_pickup setSelected:NO];
[btn_appointment setSelected:YES];
isSelected = NO;
}
else{
[btn_pickup setSelected:YES];
[btn_appointment setSelected:NO];
isSelected = YES;
}
}
#pragma mark - calendar Event methods
- (IBAction)btn_reminder_click:(id)sender{
[self addEventTocalendar:sender];
}
- (void)addEventTocalendar:(id)sender{
EKEventStore *store = [[EKEventStore alloc] init];
[store requestAccessToEntityType:EKEntityTypeEvent completion:^(BOOL granted, NSError
*error) {
if (!granted) { return; }
EKEvent *event = [EKEvent eventWithEventStore:store];
event.title = @"Pickup Reminder";
event.startDate = self.selectedDate;
event.endDate = [event.startDate dateByAddingTimeInterval:60*60];//set 1 hour meeting
event.notes = txt_notes.text;
event.recurrenceRules = EKRecurrenceFrequencyDaily;
[event addAlarm:[EKAlarm alarmWithRelativeOffset:60.0f * -5.0f]];
if (selectedIndex == 1) {
[event addRecurrenceRule:[[EKRecurrenceRule
alloc]initRecurrenceWithFrequency:EKRecurrenceFrequencyDaily interval:1 end:Nil]];
}
else if (selectedIndex == 2){
[event addRecurrenceRule:[[EKRecurrenceRule
alloc]initRecurrenceWithFrequency:EKRecurrenceFrequencyWeekly interval:1 end:Nil]];
}
else if (selectedIndex == 3){
[event addRecurrenceRule:[[EKRecurrenceRule
alloc]initRecurrenceWithFrequency:EKRecurrenceFrequencyMonthly interval:1 end:Nil]];
}
else if (selectedIndex == 4){
[event addRecurrenceRule:[[EKRecurrenceRule
alloc]initRecurrenceWithFrequency:EKRecurrenceFrequencyYearly interval:1 end:Nil]];
}
[event setCalendar:[store defaultCalendarForNewEvents]];
NSError *err = nil;
[store saveEvent:event span:EKSpanThisEvent commit:YES error:&err];
NSString *savedEventId = event.eventIdentifier; //this is so you can access this
event later
BOOL isSuceess=[store saveEvent:event span:EKSpanThisEvent error:&err];
// This needs to be done as the UIKIT was getting called from the seconadary thread
and therefore to show the alert view in the main thread and to prevent the hanging of
the app I have to call the Aletview method in the main thread.
// i.e dispatch the event in the main thread
if(isSuceess){
UIAlertView *alertview = [[UIAlertView alloc] initWithTitle:@"Event"
message:@"Event added in calendar" delegate:self cancelButtonTitle:@"OK"
otherButtonTitles:nil];
dispatch_async(dispatch_get_main_queue(), ^{
[alertview show];
});
}
else {
UIAlertView *alertview = [[UIAlertView alloc] initWithTitle:@"Event" message:[err
description] delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
dispatch_async(dispatch_get_main_queue(), ^{
[alertview show];
});
}
}];
}
- (void)back{
[self.navigationController popViewControllerAnimated:YES];
}
#pragma mark - UIAlertViewDelegate methods
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
[self.navigationController popViewControllerAnimated:YES];
}
#pragma mark - Implementation methods
- (void)serviceWasSelected:(NSNumber *)selectedIndex element:(id)element {
self.selectedIndex = [selectedIndex intValue];
//may have originated from textField or barButtonItem, use an IBOutlet instead of element
self.txt_repeatAlarm.text = [self.arr_repeatAlarm objectAtIndex:self.selectedIndex];
}
- (void)dateWasSelected:(NSDate *)selectedDate element:(id)element{ //indexpath:
(NSIndexPath *)indexpath{
UITextField * textfield = (UITextField *)element;
if (textfield == self.txt_remindOn) {
self.selectedDate = selectedDate;
self.txt_remindOn.text = [self.selectedDate getDateStringInFormat:@"dd MMM yyyy
hh:mm aa"];
}
}
#pragma mark - TextField Delegate Methods
- (void)textFieldDidBeginEditing:(UITextField *)textField{
self.txt_currentFocussedTextField = textField;
[[AppDelegate sharedInstance] addToolbarForKeyboard:textField];
if (textField == self.txt_remindOn) {
[textField resignFirstResponder];
_actionSheetPicker = [[ActionSheetDatePicker alloc] initWithTitle:@""
datePickerMode:UIDatePickerModeDateAndTime selectedDate:self.selectedDate
minimumDate:[NSDate
date] maximumDate:Nil target:self action:@selector(dateWasSelected:element:)
origin:textField];
self.actionSheetPicker.hideCancel = NO;
[self.actionSheetPicker showActionSheetPicker];
}
if (textField == self.txt_repeatAlarm) {
[textField resignFirstResponder];
[ActionSheetStringPicker showPickerWithTitle:@"" rows:self.arr_repeatAlarm
initialSelection:self.selectedIndex target:self
successAction:@selector(serviceWasSelected:element:)
cancelAction:@selector(actionPickerCancelled:) origin:textField];
}
}
// making the keyboard disappear on pressing the Done button on the keyboard.
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
[textField resignFirstResponder];
return NO;
}
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range
replacementText:(NSString *)text {
if([text isEqualToString:@"\n"]) {
[textView resignFirstResponder];
return NO;
}
return YES;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end