如何引用文本字段并将其输入可变数组答案

【问题标题】：How do you reference a textfield and enter it into a mutable array如何引用文本字段并将其输入可变数组
【发布时间】：2012-02-29 17:36:12
【问题描述】：

所以我需要将在文本字段中输入的任何内容保存到 nsmutablearray 中（这必须发生多次！并且每次都必须保存为另一个对象）。但无论我做什么显然都不起作用，因为它说“文本”不在结构或联合中。这是我的代码。感谢您的任何意见！

问题在于输入的ClassText 方法。

#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 arrayWithObject:sender.text];
        [classesEntered = [NSMutableArray alloc] init];
        [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

【问题讨论】：

标签： objective-c object nsmutablearray uitextfield

【解决方案1】：

按下按钮时，您应该获取输入的内容，将其转换为字符串，然后将该字符串保存到数组中。这应该很容易实现。下面是一些示例代码：

@interface

NSMutableArray *theArray;

@implementation

- (BOOL)textFieldShouldReturn:(UITextField *)textField {

NSString *theStringToAdd = textField.text;
[theArray addObject:theStringToAdd];

}

注意我没有测试过这段代码！

【讨论】：

不应该是：[theArray addObject:theStringToAdd]; ?
如果您想关闭键盘，请不要忘记 [textField resignFirstResponder]。

【解决方案2】：

问题出在这里：

- (IBAction)enteredClassText:(id)sender {
    NSMutableArray *classesEntered = [NSMutableArray arrayWithObject:sender.text];
    [classesEntered = [NSMutableArray alloc] init];
    [classesEntered release];

}

要解决此问题，请尝试将其引用为

[(UITextField*)sender text]

所以你的最终代码应该是这样的：

 - (IBAction)enteredClassText:(id)sender {
    NSMutableArray *classesEntered = [NSMutableArray arrayWithObject:[(UITextField*)sender text]];
    [classesEntered = [NSMutableArray alloc] init];
    [classesEntered release];

}

这告诉程序假设发送者是一个 UITextView。

【讨论】：