IOS UITextField

最新推荐文章于 2024-04-11 23:06:31 发布

转载最新推荐文章于 2024-04-11 23:06:31 发布 · 147 阅读

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#iOS UITextField

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该博客展示了iOS开发中UITextField的使用代码。包括创建UILabel作为前缀标签，设置UITextField的边框样式、占位文本等属性，添加到视图并设置代理。还实现了文本框开始编辑、结束编辑及处理返回键的相关方法。

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#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];


    [self addTextField];
   }
-(void)addTextField{
    // This allocates a label
    UILabel *prefixLabel = [[UILabel alloc]initWithFrame:CGRectZero];
    //This sets the label text
    prefixLabel.text =@"## ";
    // This sets the font for the label
    [prefixLabel setFont:[UIFont boldSystemFontOfSize:14]];
    // This fits the frame to size of the text
    [prefixLabel sizeToFit];

    // This allocates the textfield and sets its frame
    UITextField *textField = [[UITextField alloc] initWithFrame:
                              CGRectMake(20, 50, 280, 30)];

    // This sets the border style of the text field
    textField.borderStyle = UITextBorderStyleRoundedRect;
    textField.contentVerticalAlignment =
    UIControlContentVerticalAlignmentCenter;
    [textField setFont:[UIFont boldSystemFontOfSize:12]];

    //Placeholder text is displayed when no text is typed
    textField.placeholder = @"Simple Text field";

    //Prefix label is set as left view and the text starts after that
    textField.leftView = prefixLabel;

    //It set when the left prefixLabel to be displayed
    textField.leftViewMode = UITextFieldViewModeAlways;

    // Adds the textField to the view.
    [self.view addSubview:textField];

    // sets the delegate to the current class
    textField.delegate = self;
}

// pragma mark is used for easy access of code in Xcode
#pragma mark - TextField Delegates

// This method is called once we click inside the textField
-(void)textFieldDidBeginEditing:(UITextField *)textField{
NSLog(@"Text field did begin editing");
}

// This method is called once we complete editing
-(void)textFieldDidEndEditing:(UITextField *)textField{
NSLog(@"Text field ended editing");
}

// This method enables or disables the processing of return key
-(BOOL) textFieldShouldReturn:(UITextField *)textField{
    [textField resignFirstResponder];
    return YES;
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end