iOS—— UIPickerView

iOS—— UIPickerView

前言

在绝大部分App中，我们都可以见到一个强大的控件——UIPickerView，它可以用来选择地区，选择时间等等，所以如何掌握UIPickerView就变得特别重要，下面简单的说一下UIPickerView的实现过程：

实现过程

UIPickerView的创建类似于UITableView的建立，
首先，UIPickerView是需要遵循数据源和代理两个协议的，
所以我们在使用前需要先添加这两个协议：

@interface ViewController : UIViewController<
UIPickerViewDelegate,
UIPickerViewDataSource
>
@property (nonatomic, strong) UIPickerView* pickerView;

我们必须实现的方法有：

// 列数
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
    return 2;
}

//行数
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
    return 10;
}
// 还有一个比较重要的方法：
// 设置选择的响应事件
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component

接着我们定义实现一下别的内容就行：

#import "ViewController.h"
#import "ZGPickerView.h"

#define kScreenSize [UIScreen mainScreen].bounds.size
#define Width [UIScreen mainScreen].bounds.size.width
#define Height [UIScreen mainScreen].bounds.size.height

@interface ViewController ()<ZGPickerViewDelegate>

@property (nonatomic,strong) ZGPickerView *pickerView;
@property (nonatomic, strong) NSMutableArray* pickerDataSource;
@property (nonatomic,strong) NSMutableDictionary *selectedCache;
@property (nonatomic,assign) BOOL hasSetSelectedRow;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    [self setupPickerView];
//    [self initMemberVar];
//    [self initSelectedCache];
}

#pragma mark - zgpickerview delegate
- (void)ZGPickerView:(ZGPickerView *)pickerView currentComponent:(NSInteger)currentComponent currentRow:(NSInteger)currentRow
{
    NSLog(@"currentRow=%ld,currentComponent%ld",currentRow,currentComponent);
}

#pragma mark - method
- (void)setupPickerView{
    self.title = @"Second";
    self.view.backgroundColor = [UIColor whiteColor];
    CGFloat width = Width;
    CGFloat height = Height;
    CGFloat originX = (kScreenSize.width - width)*0.5;
    CGFloat originY = (kScreenSize.height - height)*0.5;
    
    self.pickerView = [[ZGPickerView alloc] initWithFrame:CGRectMake(originX, originY, width, height)];
    self.pickerView.dataArr = /*@[@"aaa",@"bbb",@"ccc",@"hhh",@"ddd",@"eee"];//*/[self getData];
    self.pickerView.defaultSelectedRow = /*@[@(2)];//*/@[@(5),@(0),@(10),@(15)];

    self.pickerView.pvDelegate = self;
    [self.view addSubview:self.pickerView];
    [self.pickerView reloadAllComponents];
}




- (NSArray*)getData{
    NSMutableArray* arr = [NSMutableArray new];
    NSMutableArray* agetemp = [NSMutableArray new];
    for (int i = 0; i < 37; i++) {
        [agetemp addObject:[NSString stringWithFormat:@"%d个月",i]];
    }
    for (int i = 4; i <= 120; i++) {
        NSString* str = [NSString stringWithFormat:@"%d岁",i];
        [agetemp addObject:str];
    }
    [arr addObject:agetemp];
    [arr addObject:@[@"男",@"女"]];
    NSMutableArray* talltemp = [NSMutableArray new];
    for (int i = 10; i < 230; i++) {
        NSString* str = [NSString stringWithFormat:@"%dcm",i];
        [talltemp addObject:str];
    }
    [arr addObject:talltemp];
    NSMutableArray* weighttemp = [NSMutableArray new];
    for (int i = 3; i < 200; i++) {
        NSString* str = [NSString stringWithFormat:@"%dkg",i];
        [weighttemp addObject:str];
    }
    [arr addObject:weighttemp];
    return [arr copy];
}

看一下运行结果：

代码007普通

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