Ios 如何将文本字段添加到NSMutableArray
我试图将输入到文本字段中的内容呈现到稍后将显示的nsmutable数组中。 我认为问题出在-voidviewDidLoad方法中,但为了以防万一,我包含了所有代码。问题是,我将离开此页面,然后在选择另一条信息后返回该页面。发生这种情况时,我需要跟踪输入文本字段的每一项内容。谢谢你的帮助Ios 如何将文本字段添加到NSMutableArray,ios,nsmutablearray,uitextfield,viewdidload,Ios,Nsmutablearray,Uitextfield,Viewdidload,我试图将输入到文本字段中的内容呈现到稍后将显示的nsmutable数组中。 我认为问题出在-voidviewDidLoad方法中,但为了以防万一,我包含了所有代码。问题是,我将离开此页面,然后在选择另一条信息后返回该页面。发生这种情况时,我需要跟踪输入文本字段的每一项内容。谢谢你的帮助 #import "EnteringCoursesViewController.h" #import "SelectRotationController.h" @implementation EnteringC
#import "EnteringCoursesViewController.h"
#import "SelectRotationController.h"
@implementation EnteringCoursesViewController
@synthesize classField;
@synthesize indicatedClass;
@synthesize labelClassTitle;
@synthesize selectRotationController;
@synthesize classesEnteredTable;
- (IBAction)chooseType {
UIActionSheet *typeSheet = [[UIActionSheet alloc]
initWithTitle:@"Class types"
delegate:self
cancelButtonTitle:nil
destructiveButtonTitle:nil
otherButtonTitles:@"Core Class", @"Elective", nil];
[typeSheet showInView:self.view];
[typeSheet release];
}
- (void)actionSheet:(UIActionSheet *)typeSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
if (buttonIndex == 0) {
self.indicatedClass = classField.text;
NSString *indicatedString = indicatedClass;
NSString *greeting = [[NSString alloc]
initWithFormat:@"%@ meets 6 times per rotation", indicatedString];
labelClassTitle.text = greeting;
labelClassTitle.hidden = NO;
[greeting release];
[indicatedClass release];
}
else if (buttonIndex == 1) {
self.indicatedClass = classField.text;
NSString *indicatedString = indicatedClass;
NSString *greeting = [[NSString alloc]
initWithFormat:@"%@ meets 3 times per rotation", indicatedString];
labelClassTitle.text = greeting;
labelClassTitle.hidden = NO;
[greeting release];
[indicatedClass release];
}
}
- (IBAction)chooseFirstMeeting:(id)sender {
SelectRotationController *selectView = [[SelectRotationController alloc]
initWithNibName:@"SelectRotationController"
bundle:[NSBundle mainBundle]];
[selectView.navigationItem setTitle:@"First Period Day Choose"];
[self.navigationController pushViewController:self.selectRotationController animated:YES];
self.selectRotationController = selectView;
[selectView release];
}
- (IBAction)enteredClassText:(id)sender {
NSMutableArray *classesEntered = [[NSMutableArray alloc] init];
[classesEntered addObject:indicatedClass];
[classesEntered release];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
- (void)viewDidLoad {
self.navigationItem.hidesBackButton = YES;
[super viewDidLoad];
}
- (void)viewDidUnload {
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc {
[classField release];
[labelClassTitle release];
[indicatedClass release];
[selectRotationController release];
[classesEnteredTable release];
[super dealloc];
}
@end
如果调用viewDidLoad,则指示类尚未初始化,因此为零 如果要通过离开视图来保存,请在viewDidUnload方法中添加addObject调用。当然,您应该检查该值是否为零 我看不到你的变量指示类有任何alloc,但是发布了!?如果调用viewDidUnload,可能是变量不存在 编辑 初始化NSMutableArray,将对象添加到此数组中,然后释放该对象。因此,数据是不存在的。您必须保存数组,以便以后使用内容。关键词:NSUserDefaults 还应检查零值:
- (IBAction)enteredClassText:(id)sender {
if (indicatedClass != nil) {
NSMutableArray *classesEntered = [[NSMutableArray alloc] init];
[classesEntered addObject:indicatedClass];
[classesEntered release];
}
}
如果发件人是UILabel,您也可以使用以下代码段:
- (IBAction)enteredClassText:(id)sender {
if (sender.text != nil) {
NSMutableArray *classesEntered = [NSMutableArray arrayWithObject:sender.text];
// TODO: Save your array to NSUserDefaults...
}
}
那么,这个改变了的代码呢?在另一个方法中使用代码。
- (IBAction)enteredClassText:(id)sender {
if (sender.text != nil) {
NSMutableArray *classesEntered = [NSMutableArray arrayWithObject:sender.text];
// TODO: Save your array to NSUserDefaults...
}
}