创建一个类别
- xxxxx.h
//
// UITextField+ExtentRange.h
// HuiTing
//
// Created by Jason on 2017/8/3.
// Copyright © 2017年 Jason. All rights reserved.
//
#import <UIKit/UIKit.h>
@interface UITextField (ExtentRange)
- (NSRange) selectedRange;
- (void) setSelectedRange:(NSRange) range;
@end
- xxxxx.m
//
// UITextField+ExtentRange.m
// HuiTing
//
// Created by Jason on 2017/8/3.
// Copyright © 2017年 Jason. All rights reserved.
//
#import "UITextField+ExtentRange.h"
@implementation UITextField (ExtentRange)
- (NSRange) selectedRange
{
UITextPosition* beginning = self.beginningOfDocument;
UITextRange* selectedRange = self.selectedTextRange;
UITextPosition* selectionStart = selectedRange.start;
UITextPosition* selectionEnd = selectedRange.end;
const NSInteger location = [self offsetFromPosition:beginning toPosition:selectionStart];
const NSInteger length = [self offsetFromPosition:selectionStart toPosition:selectionEnd];
return NSMakeRange(location, length);
}
- (void) setSelectedRange:(NSRange) range
{
UITextPosition* beginning = self.beginningOfDocument;
UITextPosition* startPosition = [self positionFromPosition:beginning offset:range.location];
UITextPosition* endPosition = [self positionFromPosition:beginning offset:range.location + range.length];
UITextRange* selectionRange = [self textRangeFromPosition:startPosition toPosition:endPosition];
[self setSelectedTextRange:selectionRange];
}
@end
