UItextField通常用于外部数据输入，以实现人机交互。比如我们QQ、微信的登录界面中让你输入账号和密码的地方
#import "ViewController.h"
@interface ViewController ()
{
UITextField *_textField;
}
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor blackColor];
// 创建TextField
[self creatTextField];
// TextField属性设置
[self setTextFieldPro];
// TextField文本属性设置
[self setTextOfTextFieldPro];
// TextField keyBoard设置
[self setKeyBoardOfTextField];
}
- (void)creatTextField
{
_textField = [[UITextField alloc] initWithFrame:CGRectMake(20, 100, 300, 50)];
_textField.backgroundColor = [UIColor yellowColor];
[self.view addSubview:_textField];
}
- (void)setTextFieldPro
{
// 1. 设置边框
// UITextBorderStyleNone, 没有边框
// UITextBorderStyleLine, 线性边框
// UITextBorderStyleBezel, 尖角边框
// UITextBorderStyleRoundedRect // 圆角矩形
_textField.borderStyle = UITextBorderStyleLine;
// 2. 设置图片(设置边框不能设置UITextBorderStyleRoundedRect，否则没有效果)
// _textField.background = [UIImage imageNamed:@"11"];
// 3. 设置编辑状态(NO，用户点击没有响应)
_textField.enabled = YES;
}
- (void)setTextOfTextFieldPro
{
// 1.默认文字
// _textField.text = @"奔跑吧，少年";
// 2. 设置字体颜色
_textField.textColor = [UIColor redColor];
// 3. 设置文字的对齐方式
// _textField.textAlignment = NSTextAlignmentCenter;
// 4. 设置文字的大小
_textField.font = [UIFont systemFontOfSize:30];
// 5. 设置占位文字
// _textField.placeholder = @"请输入密码";
// 6. 清除原有文字
_textField.clearsOnBeginEditing = YES;
// 让_textField成为键盘的第一响应者
[_textField becomeFirstResponder];
// 判断是不是在编辑状态
BOOL boo = _textField.isEditing;
// 设置清除按钮什么时候显示
_textField.clearButtonMode = UITextFieldViewModeAlways;
// 设置_textField 左视图(左右视图只能显示一个)
UIImageView *leftImageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 50, 50)];
leftImageView.image = [UIImage imageNamed:@"TM"];
_textField.leftView = leftImageView;
_textField.leftViewMode = UITextFieldViewModeAlways;
// _textField.rightView = leftImageView;
// _textField.rightViewMode = UITextFieldViewModeAlways;
// 密文显示
// _textField.secureTextEntry = YES;
// 是否自动大小写
// UITextAutocapitalizationTypeNone,
// UITextAutocapitalizationTypeWords, // 单词首字母大写
// UITextAutocapitalizationTypeSentences,// 句子首字母大写
// UITextAutocapitalizationTypeAllCharacters // 全大写
// _textField.autocapitalizationType = UITextAutocapitalizationTypeAllCharacters;
}
- (void)setKeyBoardOfTextField
{
// 设置键盘的颜色
_textField.keyboardAppearance = UIKeyboardAppearanceDark;
// 设置键盘的类型
// UIKeyboardTypeNumberPad 只能输入数字
_textField.keyboardType = UIKeyboardTypeURL;
// 返回按钮的样式
_textField.returnKeyType = UIReturnKeyNext;
// 设置键盘的二级键盘
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 50)];
imageView.image = [UIImage imageNamed:@"TM"];
_textField.inputAccessoryView = imageView;
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
// 移除第一响应者 （键盘退出）
[_textField resignFirstResponder];
NSLog(@"%@",_textField.text);
}
@end
@interface ViewController ()<UITextFieldDelegate>
{
UITextField *_textField;
}
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
[self addTextFieldToView];
}
- (void)addTextFieldToView
{
_textField = [[UITextField alloc] initWithFrame:CGRectMake(0, 100, self.view.frame.size.width, 80)];
_textField.backgroundColor = [UIColor lightGrayColor];
_textField.font = [UIFont systemFontOfSize:40];
_textField.placeholder = @"请输入文字";
_textField.clearButtonMode = UITextFieldViewModeAlways;
// 设置代理
_textField.delegate = self;
[self.view addSubview:_textField];
}
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
NSLog(@"将要编辑");
// YES 可以继续编辑 NO 不让编辑
return YES;
}
- (BOOL)textFieldShouldEndEditing:(UITextField *)textField
{
NSLog(@"---%@",textField.text);
NSLog(@"将要结束编辑的时候");
return YES;
}
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
NSLog(@"已经开始编辑");
}
- (void)textFieldDidEndEditing:(UITextField *)textField
{
NSLog(@"已经结束编辑");
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
[_textField resignFirstResponder];
}
- (BOOL)textFieldShouldClear:(UITextField *)textField
{
NSLog(@"清除的时候");
// NO 不让清除 YES 让清除
return NO;
}
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
NSLog(@"点击了Return按钮的时候");
return YES;
}
#pragma mark - 用户每次输入信息的或删除的时候都调用
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
NSLog(@"%ld-- %@",range.length,string);
return YES;
}
@end
#import "ViewController.h"
@interface ViewController ()
{
UITextField *_textField;
}
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// 添加UITextField
[self addTextField];
// 添加检测给键盘
[self keyBaordShowOrHide];
}
- (void)addTextField
{
CGFloat textFieldX = 20;
CGFloat textFieldW = self.view.frame.size.width - 2 * textFieldX;
CGFloat textFieldH = 50;
CGFloat textFieldY = 500;
_textField = [[UITextField alloc] initWithFrame:CGRectMake(textFieldX, textFieldY, textFieldW, textFieldH)];
_textField.backgroundColor = [UIColor lightGrayColor];
[self.view addSubview:_textField];
}
- (void)keyBaordShowOrHide
{
// 检测键盘弹出
// 1. 谁去检测
// 2. 检测到键盘弹出执行什么方法
// 3. 区别消息是不是键盘弹出的消息
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(showKeyBoard:) name:UIKeyboardWillShowNotification object:nil];
//检测键盘消失
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(hideKeyBoard:) name:UIKeyboardWillHideNotification object:nil];
}
- (void)hideKeyBoard:(NSNotification *)sender
{
NSLog(@"键盘消失");// 输入框还原
// view 位置还原
self.view.transform = CGAffineTransformIdentity;
}
- (void)showKeyBoard:(NSNotification *)sender
{
NSLog(@"键盘弹起");
NSLog(@"%@",sender);
// 获取键盘的高度
CGRect rect = [[sender.userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
CGFloat keyBoardH = rect.size.height;
// 让整个屏幕往上移动一个键盘的高度
self.view.transform = CGAffineTransformMakeTranslation(0, - keyBoardH + 100);
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
[_textField resignFirstResponder];
}
@end
原文：http://www.cnblogs.com/mcj-coding/p/5119615.html