自定义控件-PickerView

最新推荐文章于 2024-08-28 19:34:14 发布

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最新推荐文章于 2024-08-28 19:34:14 发布

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分类专栏： iOS UI 文章标签：控件自定义应用选择国旗界面

本文链接：https://blog.youkuaiyun.com/u012701023/article/details/48931171

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本文深入探讨了iOS开发技术，包括Swift、Xcode、UIKit等核心组件的应用与实践，旨在帮助开发者掌握iOS应用开发的完整流程。

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#import "ViewController.h"
#import "QHFlag.h"
#import "QHFlagView.h"

@interface ViewController ()<UIPickerViewDataSource,UIPickerViewDelegate>

@property (nonatomic, strong) NSArray *flags;

@end

@implementation ViewController


- (NSArray *)flags
{
    if (!_flags) {
        NSArray *dictArray = [NSArray arrayWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"flags.plist" ofType:nil]];
        NSMutableArray *flagArray = [NSMutableArray array];
        for (NSDictionary *dict in dictArray) {
            QHFlag *flag = [QHFlag flagWithDict:dict];
            [flagArray addObject:flag];
        }
        _flags = flagArray;
    }
    return _flags;
}
- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}


- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    return 1;
}

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    return self.flags.count;
}

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
{
    //1.创建flagView
    QHFlagView *flagView = [QHFlagView flagViewWithResuingView:view];
    
    flagView.flag = self.flags[row];
    return flagView;
    
}

- (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component
{
    return [QHFlagView flagViewHeight];
}

数据模型

#import <Foundation/Foundation.h>

@interface QHFlag : NSObject

@property (nonatomic, copy) NSString *name;
@property (nonatomic, copy) NSString *icon;

+ (instancetype)flagWithDict:(NSDictionary *)dict;

- (instancetype)initWithDict:(NSDictionary *)dict;

@end

#import "QHFlag.h"

@implementation QHFlag

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

- (instancetype)initWithDict:(NSDictionary *)dict
{
    if (self = [super init]) {
        [self setValuesForKeysWithDictionary:dict];
    }
    return self;
}

@end

#import <UIKit/UIKit.h>
@class QHFlag;
@interface QHFlagView : UIView
@property (nonatomic, strong) QHFlag *flag;

+ (instancetype)flagViewWithResuingView:(UIView *)resuingView;
+ (CGFloat)flagViewHeight;
@end

#import "MJFlagView.h"
#import "QHFlag.h"

@interface MJFlagView()

@property (weak, nonatomic) IBOutlet UILabel *nameLabel;
@property (weak, nonatomic) IBOutlet UIImageView *iconView;

@end


@implementation QHFlagView
+ (instancetype)flagViewWithResuingView:(UIView *)resuingView
{
    if (resuingView == nil) {
        return [[[NSBundle mainBundle] loadNibNamed:@"MJFlagView" owner:nil options:nil] lastObject];
    } else {
        return (QHFlagView *)resuingView;
    }
}

- (void)setFlag:(QHFlag *)flag
{
    _flag = flag;
    
    // 1.名称
    self.nameLabel.text = flag.name;
    
    // 2.图标
    self.iconView.image = [UIImage imageNamed:flag.icon];
}

+ (CGFloat)flagViewHeight
{
    return 44;
}
@end