// 模型数据
// LZFlagItem.h
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>

@interface LZFlagItem : NSObject

/** 国家名称*/
@property (nonatomic, strong) NSString *name;
/** 图片*/
@property (nonatomic, strong) UIImage *icon;

// 快速构造方法
- (instancetype)initWithDict:(NSDictionary *)dict;
+ (instancetype)flagItemDict:(NSDictionary *)dict;

@end

// LZFlagItem.m
#import "LZFlagItem.h"

@implementation LZFlagItem

// 快速构造方法
- (instancetype)initWithDict:(NSDictionary *)dict
{
    if (self = [super init]) {
        // KVC
        [self setValuesForKeysWithDictionary:dict];
    }
    return self;
}

+ (instancetype)flagItemDict:(NSDictionary *)dict
{
    return [[self alloc] initWithDict:dict];
}

- (void)setIcon:(UIImage *)icon
{
    // 转换类型
    NSString *imageName = (NSString *)icon;
    UIImage *iconImage = [UIImage imageNamed:imageName];
    _icon = iconImage;
}

@end

LZFlagTextF继承UITextField

// LZFlagTextF.h
#import <UIKit/UIKit.h>
@class LZFlagItem;

@interface LZFlagTextF : UITextField

/** 模型数据*/
@property (nonatomic, strong) LZFlagItem *flagItem;

@end


// LZFlagTextF.m
#import "LZFlagTextF.h"
#import "LZFlagItem.h"
#import "LZFlagView.h"

@interface LZFlagTextF () <UIPickerViewDataSource, UIPickerViewDelegate>

/** 模型数据的数组*/
/** 模型数组*/
@property (nonatomic, strong) NSArray *flagArray;

@end


@implementation LZFlagTextF

#pragma mark - 懒加载数据
- (NSArray *)flagArray
{
    if (_flagArray == nil) {
        // 路径
        NSString *path = [[NSBundle mainBundle] pathForResource:@"flags.plist" ofType:nil];
        NSArray *array = [NSArray arrayWithContentsOfFile:path];
        // 定义可变数组
        NSMutableArray *arrM = [NSMutableArray array];
        // 添加模型数据
        for (NSDictionary *dict in array) {
            LZFlagItem *flagItem = [LZFlagItem flagItemDict:dict];
            [arrM addObject:flagItem];
        }
        _flagArray = arrM;
    }
    return _flagArray;
}

// 代码创建的时候调用
- (instancetype)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        [self setup];
    }
    return self;
}

// 从storyboard或者xib中创建的时候调用
- (void)awakeFromNib
{
    [self setup];
}

// 设置
- (void)setup
{
    UIPickerView *pickV = [[UIPickerView alloc] init];
    pickV.dataSource = self;
    pickV.delegate = self;
    //修改键盘的类型
    self.inputView = pickV;
}

#pragma mark - UIPickerViewDataSource 方法
// 多少列
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    return 1;
}

// 每列多少行
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    return self.flagArray.count;
}

// 每行显示什么内容
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
{
    // 获取模型
    LZFlagItem *flagItem = self.flagArray[row];
    // 创建LZFlagView对象
    LZFlagView *flagV = [LZFlagView flagView];
    flagV.flagItem = flagItem;
    // 返回一个UIView对象
    return flagV;
}

// 行高
- (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component
{
    return 80;
}

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    // 取出当前选中的行模型
    LZFlagItem *item = self.flagArray[row];
    self.text = item.name;
}

@end

视图:

// LZFlagView.h
#import <UIKit/UIKit.h>
@class LZFlagItem;

@interface LZFlagView : UIView

+ (instancetype)flagView;

/**
 *  模型数据
 */
/** 国旗*/
@property (nonatomic, strong) LZFlagItem *flagItem;

@end

// LZFlagView.m
#import "LZFlagView.h"
#import "LZFlagItem.h"

@interface LZFlagView ()

/** 国籍*/
@property (weak, nonatomic) IBOutlet UILabel *name;
/** 国籍图片*/
@property (weak, nonatomic) IBOutlet UIImageView *iconImageView;

@end


@implementation LZFlagView

/**
 * [NSBundle mainBundle] 可以简单理解为就是一个包，找到对应程序的app，右击显示包内容，显示的所有内容都是属于它的，表示的是一个程序包里面的所有东西，在这里它会自动去搜索里面的资源文件，如果在第一级目录里面没有找到，那么它会自动去下一级目录里面找到，一直找到为止
 */
+ (instancetype)flagView
{

    return [[[NSBundle mainBundle] loadNibNamed:NSStringFromClass([self class]) owner:nil options:nil] lastObject];
}

- (void)setFlagItem:(LZFlagItem *)flagItem
{
    _flagItem = flagItem;
    self.name.text = flagItem.name;
    self.iconImageView.image = flagItem.icon;

}

@end

LZFlagView.xib图片:

运行效果图片: