可以替换 UITextField 就可以达到校验目的的工具：US2FormValidator

US2FormValidator是一款iOS框架，用于方便地验证文本字段和文本视图中的输入。该框架支持自定义验证条件，如使用正则表达式创建条件及自定义验证器等。

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https://github.com/ustwo/US2FormValidator

ustwo™ iOS Form Validator

This framework allows you to validate inputs of text fields and text views in a convenient way.

Features

Simply use US2ValidatorTextField instead of UITextField (US2ValidatorTextView instead of UITextView)
Know what went wrong and where
Create own conditions using regular expressions for example
Create own validators which contain a collection of conditions

Installation

Clone the project

Clone the project from the link above.

Import the framework project into your project

Set target dependencies

Add US2Localizable.strings to your projects Copy Bundle Resources

Installation using CocoaPods

How to use CocoaPods? Go to: https://github.com/CocoaPods/CocoaPods

Add the following line to your pod file:

pod 'US2FormValidator', '~> 1.0.8'

How-To

Add a condition to validator

US2Validator *validator = [[US2Validator alloc] init];

US2ConditionAlphabetic *condition = [[US2ConditionAlphabetic alloc] init];
[validator addCondition:condition];
[condition release];

US2ConditionCollection *conditionCollection1 = [validator checkConditions:@"HelloWorld"];
US2ConditionCollection *conditionCollection2 = [validator checkConditions:@"Hello World 123"];

BOOL isValid = conditionCollection1 == nil;                                                  // isValid == YES
isValid = conditionCollection2 == nil;                                                       // isValid == NO

// What went wrong?
NSLog(@"conditionCollection2: %@", conditionCollection2);

Add a validation text field

US2ValidatorTextField *firstNameTextField  = [[US2ValidatorTextField alloc] init];
firstNameTextField.validator               = [[[MyProjectValidatorName alloc] init] autorelease];
firstNameTextField.shouldAllowViolation    = YES;
firstNameTextField.validateOnFocusLossOnly = YES;
firstNameTextField.placeholder             = @"Enter first name";
firstNameTextField.validatorUIDelegate     = self;
[_textUICollection addObject:firstNameTextField];
[firstNameTextField release];

Create own condition

Create the interface.

#import <Foundation/Foundation.h>
#import "US2Condition.h"


@interface MyProjectConditionName : US2Condition

@end

Create the implementation.

#import "MyProjectConditionName.h"


@implementation MyProjectConditionName

- (BOOL)check:(NSString *)string
{
    if (nil == string)
        string = [NSString string];

    self.regexString = @"[a-zA-Z .-]";

    return [super check:string];
}


#pragma mark - Allow violation

- (BOOL)shouldAllowViolation
{
    return YES;
}


#pragma mark - Localization

- (NSString *)localizedViolationString
{
    return @"Not a valid name";
}


@end

Create own validator

Create the interface.

#import <Foundation/Foundation.h>
#import "US2Validator.h"


#pragma mark - Validator interface

@interface MyProjectValidatorName : US2Validator
{
}


@end

Create the implementation.

#import "MyProjectValidatorName.h"
#import "MyProjectConditionName.h"
#import "US2ConditionRange.h"


@implementation MyProjectValidatorName


#pragma mark - Initialization

- (id)init
{
    self = [super init];
    if (self)
    {
        [self addCondition:[[[MyProjectConditionName alloc] init] autorelease]];

        US2ConditionRange *rangeCondition   = [[[US2ConditionRange alloc] init] autorelease];
        rangeCondition.range                = NSMakeRange(2, UINT16_MAX);
        rangeCondition.shouldAllowViolation = YES;

        [self addCondition:rangeCondition];
    }

    return self;
}


@end