//
//  UITextField+MTLimit.m
//  Meet
//
//  Created by ko1o on 2018/10/22.
//  Copyright © 2018年 ko1o. All rights reserved.
//

#import "UITextField+MTLimit.h"
#import "NSString+MTLimit.h"
#import <objc/runtime.h>
#import "MTTextFieldLimitManager.h"
@implementation UITextField (MTLimit)

static char MTTextFieldLimitManagerKey;
- (void)mt_setupLimitTextFieldWithBytesLength:(NSInteger)maxLength delegate:(nullable id<MTTextFieldLimitDelegate>)delegate
{
    MTTextFieldLimitManager *oldLimitManager = objc_getAssociatedObject(self, &MTTextFieldLimitManagerKey);
    if (oldLimitManager) {
        [oldLimitManager removeLimitTextField:self];
    }
    
    MTTextFieldLimitManager *limitManager = [[MTTextFieldLimitManager alloc]init];
    [limitManager setupLimitTextField:self bytesLength:maxLength];
    limitManager.limitDelegate = delegate;
    objc_setAssociatedObject(self, &MTTextFieldLimitManagerKey, limitManager, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

-(NSRange)mt_selectedRange{
    NSInteger location = [self offsetFromPosition:self.beginningOfDocument toPosition:self.selectedTextRange.start];
    NSInteger length = [self offsetFromPosition:self.selectedTextRange.start toPosition:self.selectedTextRange.end];
    return NSMakeRange(location, length);
}

-(void)setMt_selectedRange:(NSRange)selectedRange
{
    UITextPosition *startPosition = [self positionFromPosition:self.beginningOfDocument offset:selectedRange.location];
    UITextPosition *endPosition = [self positionFromPosition:self.beginningOfDocument offset:selectedRange.location + selectedRange.length];
    UITextRange *selectedTextRange = [self textRangeFromPosition:startPosition toPosition:endPosition];
    [self setSelectedTextRange:selectedTextRange];
}


@end