让UITextFeld输入的时候和输入银行卡一样的格式

来源：互联网发布：菲诗小铺的洗发水知乎编辑：程序博客网时间：2024/05/22 12:49

#import "ViewController.h"

#define NUMBERS @"0123456789"

@interface ViewController () <UITextFieldDelegate> {

UITextField * _numberFielde;

UILabel *_numLabel;

}

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

_numberFielde = [[UITextField alloc] initWithFrame:CGRectMake(0, 100,self.view.frame.size.width, 50)];

_numberFielde.layer.borderColor = [UIColor grayColor].CGColor;

_numberFielde.layer.borderWidth = 1.0f;

_numberFielde.delegate = self;

_numberFielde.placeholder = @"请输入数字";

[_numberFielde becomeFirstResponder];

[self.view addSubview:_numberFielde];

UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];

button.frame = CGRectMake(100, 200, 100, 30);

[button addTarget:self action:@selector(getNum) forControlEvents:UIControlEventTouchUpInside];

[button setTitle:@"取得数字" forState:UIControlStateNormal];

[self.view addSubview:button];

_numLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 250, self.view.frame.size.width, 50)];

_numLabel.textAlignment = NSTextAlignmentCenter;

[self.view addSubview:_numLabel];

}

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {

NSCharacterSet *cs = [[NSCharacterSet characterSetWithCharactersInString:NUMBERS] invertedSet];

NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""];

BOOL basicTest = [string isEqualToString:filtered];

if (basicTest) {

if (textField == _numberFielde) {

//四位加一个空格

if ([string isEqualToString:@""]) { //删除字符

if ((textField.text.length - 2) % 5 == 0) {

textField.text = [textField.text substringToIndex:textField.text.length - 1];

}

return YES;

} else {

if (textField.text.length % 5 == 0) {

textField.text = [NSString stringWithFormat:@"%@ ", textField.text];

}

return YES;

}

} else {

return NO;

}

return YES;

}

- (void)getNum {

_numLabel.text = [self deleteSpace];

}

- (NSString *)deleteSpace {

NSString *username =_numberFielde.text;

username = [username stringByReplacingOccurrencesOfString:@" " withString:@""];

return username;

}

- (void)didReceiveMemoryWarning {

[super didReceiveMemoryWarning];

}

@end

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