iphone以编程方式创建UITextField的问题

Question

当我尝试以编程方式创建11个文本字段时,我正在努力.问题是文本字段没有显示出来.我在viewDidLoad方法中创建它们.

这是我正在使用的代码:

- (void)viewDidLoad
{
    // Determine some basic info
    int numberOfTextfields = 11;
    int textfieldHeight = 40;
    int textfieldWidth = 200;


    // Create the UIScrollView
    UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, numberOfTextfields*textfieldHeight,textfieldWidth)];


    // Create all the textfields
    NSMutableArray *textfields = [NSMutableArray arrayWithCapacity:
                                  (NSUInteger)numberOfTextfields];
    for(int i = 0; i < numberOfTextfields; i++) {
        UITextField *field = [[UITextField alloc] initWithFrame:
                              CGRectMake(0,i*textfieldHeight,textfieldHeight,textfieldWidth)];

        [scrollView addSubview:field];
        [textfields addObject:field];
    }

    [super viewDidLoad];

}

他们为什么不出现的任何线索？

提前致谢.

Answer 1

您似乎永远不会添加scrollView为子视图.

您的textFields通常是隐藏的,因为您从未设置边框样式.试试这个:

- (void)viewDidLoad
{
    // Determine some basic info
    int numberOfTextfields = 11;
    int textfieldHeight = 40;
    int textfieldWidth = 200;


    // Create the UIScrollView
    UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, textfieldWidth,numberOfTextfields*textfieldHeight)];
    scrollView.contentSize = CGSizeMake(numberOfTextfields*textfieldWidth, textfieldHeight);

    // Create all the textfields
    NSMutableArray *textfields = [NSMutableArray arrayWithCapacity:
                                  (NSUInteger)numberOfTextfields];
    for(int i = 0; i < numberOfTextfields; i++) {
        UITextField *field = [[UITextField alloc] initWithFrame:CGRectMake(0,i*textfieldHeight,textfieldWidth,textfieldHeight)];
        field.borderStyle = UITextBorderStyleRoundedRect;
        [scrollView addSubview:field];
        [textfields addObject:field];
    }

    [self.view addSubview:scrollView];

    [super viewDidLoad];
}