封装（17-08-09）

//
//  EATextField.h
//  EATextField
//
//  Created by Eiwodetianna on 2017/8/9.
//  Copyright © 2017年 lanou. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface EATextField : UITextField

@property (nonatomic, retain) UIImage *leftImage;

@property (nonatomic, retain) UIImage *leftHighlightedImage;

@property (nonatomic, assign) CGSize leftViewSize;

@property (nonatomic, retain) UIColor *placeholderTextColor;

@end

//
//  EATextField.m
//  EATextField
//
//  Created by Eiwodetianna on 2017/8/9.
//  Copyright © 2017年 lanou. All rights reserved.
//

#import "EATextField.h"

@interface EATextField ()

@property (nonatomic, retain) UIImageView *leftImageView;

@property (nonatomic, retain) NSMutableDictionary *placeholderAttributes;


@end

@implementation EATextField

- (UIImageView *)leftImageView {
    if (_leftImageView == nil) {
        CGRect leftFrame = self.bounds;
        leftFrame.size.width = self.bounds.size.height;
        self.leftView = [[UIImageView alloc] initWithFrame:leftFrame];
        self.leftImageView = (UIImageView *)self.leftView;
        self.placeholderAttributes = [NSMutableDictionary dictionary];
    }
    return _leftImageView;
}

- (void)setLeftImage:(UIImage *)leftImage {
    if (_leftImage != leftImage) {
        _leftImage = leftImage;
        self.leftImageView.image = leftImage;
        self.leftViewMode = UITextFieldViewModeAlways;
    }
}

- (void)setLeftHighlightedImage:(UIImage *)leftHighlightedImage {
    if (_leftHighlightedImage != leftHighlightedImage) {
        _leftHighlightedImage = leftHighlightedImage;
        self.leftImageView.highlightedImage = leftHighlightedImage;
        self.leftViewMode = UITextFieldViewModeAlways;
    }
}

- (BOOL)isEditing {
    BOOL isEditing = [super isEditing];
    self.leftImageView.highlighted = isEditing;
    return isEditing;
}


- (void)setLeftView:(UIView *)leftView {
    [super setLeftView:leftView];
    self.leftImageView = nil;
}

- (void)setLeftViewSize:(CGSize)leftViewSize {
    CGRect leftImageViewFrame = self.leftImageView.frame;
    leftImageViewFrame.size = leftViewSize;
        _leftViewSize = leftViewSize;
    self.leftImageView.frame = leftImageViewFrame;
}

- (void)setPlaceholderTextColor:(UIColor *)placeholderTextColor {
    if (_placeholderTextColor != placeholderTextColor) {
        _placeholderTextColor = placeholderTextColor;
        if (placeholderTextColor != nil) {
            
            _placeholderAttributes[NSForegroundColorAttributeName] = placeholderTextColor;
            if (self.placeholder) {
                
                NSAttributedString *attributePlaceholder = [[NSAttributedString alloc] initWithString:self.placeholder attributes:_placeholderAttributes];
                self.attributedPlaceholder = attributePlaceholder;
            }
        }
    }
    
}

- (void)setPlaceholder:(NSString *)placeholder {
    [super setPlaceholder:placeholder];
    if (_placeholderTextColor != nil && placeholder != nil) {
        NSAttributedString *attributePlaceholder = [[NSAttributedString alloc] initWithString:self.placeholder attributes:_placeholderAttributes];
        self.attributedPlaceholder = attributePlaceholder;
    }
}


/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
    // Drawing code
}
*/

@end

//
//  ViewController.m
//  EATextField
//
//  Created by Eiwodetianna on 2017/8/9.
//  Copyright © 2017年 lanou. All rights reserved.
//

#import "ViewController.h"
#import "EATextField.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    EATextField *text = [[EATextField alloc] initWithFrame:CGRectMake(100, 100, 200, 40)];
    text.leftImage = [UIImage imageNamed:@"icon_username.png"];
    text.leftHighlightedImage = [UIImage imageNamed:@"icon_username_select.png"];
    text.leftViewSize = CGSizeMake(30, 30);
    text.placeholderTextColor = [UIColor greenColor];
    text.placeholder = @"placeholder";
    
    text.backgroundColor = [UIColor redColor];
    [self.view addSubview:text];
    UITextField *text1 = [[EATextField alloc] initWithFrame:CGRectMake(100, 300, 200, 40)];
    text1.backgroundColor = [UIColor redColor];
    [self.view addSubview:text1];
}

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    [self.view endEditing:YES];
}




- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}


@end