58 lines
1.7 KiB
Objective-C
58 lines
1.7 KiB
Objective-C
//
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// MTTextFieldLimitManager.m
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// Meet
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//
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// Created by ko1o on 2018/10/22.
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// Copyright © 2018年 ko1o. All rights reserved.
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//
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#import "MTTextFieldLimitManager.h"
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#import "UITextField+MTLimit.h"
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@interface MTTextFieldLimitManager()
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@property (nonatomic, assign) NSInteger maxNumberOfDescriptionChars; //最大限制字符个数
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@end
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@implementation MTTextFieldLimitManager
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- (void)setupLimitTextField:(UITextField *)textField bytesLength:(NSInteger)maxLength {
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[textField addTarget:self action:@selector(textFieldDidChange:) forControlEvents:UIControlEventEditingChanged];
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self.maxNumberOfDescriptionChars = maxLength;
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}
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- (void)removeLimitTextField:(UITextField *)textField
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{
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[textField removeTarget:self action:@selector(textFieldDidChange:) forControlEvents:UIControlEventEditingChanged];
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}
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- (void)cutTextField:(UITextField *)textField bytesLength:(NSInteger)maxLength
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{
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UITextRange *selectedRange = [textField markedTextRange];
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// 获取高亮部分 中文联想
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UITextPosition *posi = [textField positionFromPosition:selectedRange.start offset:0];
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// 如果在变化中是高亮部分在变，就不要计算字符
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if (selectedRange && posi) {
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return;
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}
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if (textField.text.mt_customByteLength > maxLength) {
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textField.text = [textField.text mt_safeSubStringWithByteLength:maxLength];
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}
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}
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// 监听文本改变
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- (void)textFieldDidChange:(UITextField*)textField
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{
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[self cutTextField:textField bytesLength: self.maxNumberOfDescriptionChars];
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//设置代理 (扩展)
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if (self.limitDelegate && [self.limitDelegate respondsToSelector:@selector(limitTextFieldDidChange:)]) {
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[self.limitDelegate limitTextFieldDidChange:textField];
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}
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}
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@end
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