ios/Timi/Class/Base/Category/UITextField/UITextField+ExtentRange.m

//
//  UITextField+ExtentRange.m
//  DDTG
//
//  Created by 翟玉磊 on 16/11/8.
//  Copyright © 2016年 翟玉磊. 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  // 备注：UITextField必须为第一响应者才有效
{
    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];
}


/**
 修改默认字体颜色

 @param color 要修改成的颜色
 */
- (void)changePlaceholderColor:(UIColor *)color {
    
    self.attributedPlaceholder = [[NSAttributedString alloc] initWithString:self.placeholder attributes:@{NSForegroundColorAttributeName: color}];
}


/**
 setup Clean Button Image

 @param imageName 图片名字
 */
- (void)setupCleanButtonImageName:(NSString *)imageName {
    
    UIButton *cleanButton = [self valueForKey:@"_clearButton"];
    [cleanButton setImage:[UIImage imageNamed:imageName] forState:UIControlStateNormal];
    [cleanButton setImage:[UIImage imageNamed:imageName] forState:UIControlStateHighlighted];
}
@end