史上最强的UITextField讲解,没有之一

#import "ViewController.h"

@interface ViewController ()<UITextFieldDelegate>

@property (nonatomic,strong) UITextField *textField;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    [self.view addSubview:self.textField];
}

- (UITextField *)textField {
    if (!_textField) {
        _textField = [[UITextField alloc] init];
        _textField.frame = CGRectMake(50, 150, [UIScreen mainScreen].bounds.size.width - 100, 40);
        _textField.placeholder = @"请输入文字";
        _textField.font = [UIFont systemFontOfSize:14];
        _textField.textColor = [UIColor redColor];
        _textField.textAlignment = NSTextAlignmentLeft;
        _textField.secureTextEntry = NO;
        _textField.keyboardType = UIKeyboardTypeDefault;
        _textField.borderStyle = UITextBorderStyleRoundedRect;
        _textField.clearButtonMode = UITextFieldViewModeWhileEditing;
        _textField.returnKeyType = UIReturnKeyJoin;
        _textField.keyboardAppearance = UIKeyboardAppearanceLight;
        NSAttributedString *attrString = [[NSAttributedString alloc] initWithString:_textField.placeholder attributes:@{NSForegroundColorAttributeName:[UIColor orangeColor],NSFontAttributeName:[UIFont systemFontOfSize:14]}];//_textField.font//富文本修改占位文字的颜色
        _textField.attributedPlaceholder = attrString;
        _textField.text = @"测试";
        _textField.spellCheckingType = UITextSpellCheckingTypeNo;//拼写检查
        _textField.autocorrectionType = UITextAutocorrectionTypeYes;//自动纠正
        _textField.autocapitalizationType = UITextAutocapitalizationTypeAllCharacters;//自动大写样式
        _textField.clearsOnBeginEditing = YES;//再次编辑时是否清空之前内容；默认NO
        _textField.adjustsFontSizeToFitWidth = YES;//默认是NO  YES当充满边框时，文字会缩小，当小到一定程度时仍然会滚动；自适应宽度；
        _textField.minimumFontSize = 20;//设置滚动时最小字号，与滚动相关，要比设置的字体小，否则没有意义，没有设置这一项文字也会缩小和滚动
        [_textField setDelegate:self];
    }
    return _textField;
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    [self.view endEditing:YES];//让键盘下去
}

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
    NSLog(@"是否允许开始编辑,此刻返回的是YES,是可以开始编辑的");
    return YES;
}

- (void)textFieldDidBeginEditing:(UITextField *)textField {
    NSLog(@"开始编辑的时候调用");
    self.textField.frame = CGRectMake(50, 150, [UIScreen mainScreen].bounds.size.width - 100, 100);
}

- (BOOL)textFieldShouldEndEditing:(UITextField *)textField {
    NSLog(@"是否允许结束编辑,此刻返回的是YES,是可以结束编辑的");
    return YES;
}

- (void)textFieldDidEndEditing:(UITextField *)textField {
    NSLog(@"结束编辑的时候调用");
    self.textField.frame = CGRectMake(50, 150, [UIScreen mainScreen].bounds.size.width - 100, 40);
}

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
    NSLog(@"键盘上每次输入的字符 == %@",string);
    return YES;
}

- (BOOL)textFieldShouldClear:(UITextField *)textField {
    NSLog(@"最右边的清除按钮点击时调用,一下清除所有内容");
    return YES;
}

- (BOOL)textFieldShouldReturn:(UITextField *)textField {
    [self.view endEditing:YES];
    NSLog(@"点击键盘上的return的时候调用");
    return YES;
}

@end