【代码笔记】iOS-自定义选择框（高底强弱）

一，效果图

二，代码。

ViewController.h

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController
<UIPickerViewDataSource,UIPickerViewDelegate>

@end

ViewController.m

#import "ViewController.h"
#define Color(r, g, b,d) [UIColor colorWithRed:(r)/255.0 green:(g)/255.0 blue:(b)/255.0 alpha:d]
#define  W [UIScreen mainScreen].bounds.size.width
#define  H [UIScreen mainScreen].bounds.size.height

@interface ViewController ()
{
    NSMutableArray *arrayData;
    UIView *chooseView;
}
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    //初始化选择界面
    [self addChooseView];
}
#pragma -mark -functions
//初始化选择页面
-(void)addChooseView
{
    //背景框
    chooseView = [[UIView alloc]initWithFrame:CGRectMake(0,H- H*0.45, W, H*0.45)];
    chooseView.backgroundColor = Color(230, 230, 230, 1);
    [self.view addSubview:chooseView];

    //完成按钮上面的线
    UIView *line3 = [[UIView alloc]initWithFrame:CGRectMake(0, 0, W, 1)];
    line3.backgroundColor = Color(202, 202, 202, 1);
    [chooseView addSubview:line3];

    //完成按钮下面的线
    UIView *line4 = [[UIView alloc]initWithFrame:CGRectMake(0, 40, W, 1)];
    line4.backgroundColor = Color(202, 202, 202, 1);
    [chooseView addSubview:line4];

    //完成按钮
    UIButton *finishedBtn = [UIButton buttonWithType:UIButtonTypeCustom];
    finishedBtn.frame = CGRectMake(W-50, 5, 50, 30);
    [finishedBtn setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];
    [finishedBtn setTitle:@"完成" forState:UIControlStateNormal];
    [finishedBtn addTarget:self action:@selector(doClickFinishButton) forControlEvents:UIControlEventTouchUpInside];
    [chooseView addSubview:finishedBtn];

    UIPickerView *choosePicker = [[UIPickerView  alloc]initWithFrame:CGRectMake(0, 40, W, chooseView.bounds.size.height-40)];
    choosePicker.delegate = self;
    choosePicker.dataSource = self;
    [chooseView addSubview:choosePicker];

    arrayData=[[NSMutableArray alloc]initWithObjects:@"高",@"中",@"强",@"弱", nil];

}
#pragma -mark -doClickActions
-(void)doClickFinishButton
{
    chooseView.hidden=YES;
    NSLog(@"点击完成按钮");
}
#pragma -mark -UIPickerViewDelegate
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    return 1;
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    return arrayData.count;
}

- (NSString*)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
    return [arrayData objectAtIndex:row];
}

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    NSString *chooseStr = [NSString stringWithFormat:@"%ld", (long)row];
    NSLog(@"---chooseStr--%@",chooseStr);
}

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

@end