iOS:步进UIStepper、滑动块UISlider、开关UISwitch的基本使用

步进UIStepper、滑动块UISlider：当它们作为事件,被触发时，它们的值会发生改变。正因为如此,触发该事件时，可以一张一张翻阅浏览图片,，，，

步进UIStepper：

@property(nonatomic) double minimumValue;                 // default 0. must be less than maximumValue

@property(nonatomic) double maximumValue;                // default 100. must be greater than minimumValue

@property(nonatomic) double stepValue;                         // default 1. must be greater than 0，每次步进的距离

//滑动块触发事件(值value发生改变,范围mininum~maxnum)
- (IBAction)sliderValueChange:(UISlider *)sender
{
    NSLog(@"%lf",sender.value);
    //将滑动块的值取出并赋给步进,使得步进和滑动块事件状态相同
    [self.stepper setValue:sender.value];
}

滑动块UIStepper：

@property(nonatomic) float value;                                 // default 0.0. this value will be pinned to min/max

@property(nonatomic) float minimumValue;                   // default 0.0. the current value may change if outside new min value

@property(nonatomic) float maximumValue; 　　　　　　// default 1.0. the current value may change if outside new max value

//步进触发事件(值value发生改变,范围mininum~maxnum，可以设置步进大小step值)
- (IBAction)stepperValueChange:(UIStepper *)sender
{
    NSLog(@"%lf",sender.value);
    //将步进的值取出并赋给滑动块,使得步进和滑动块事件状态相同
    [self.slider setValue:sender.value];
}

开关UISwitch:

@property(nonatomic,getter=isOn) BOOL on;                //有两种状态,开on或关off

//开关触发事件(状态state只有两种形式:on、off)
- (IBAction)switchValueChange:(UISwitch *)sender
{
    NSLog(@"%@",sender.isOn?@"开":@"关");
}

   以下用步进和滑动块、开关做的一个图片浏览器

   源码如下：

//  ViewController.m
//  02-图片浏览器
//
//  Created by ma c on 15/8/27.
//  Copyright (c) 2015年 bjsxt. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()
@property (weak, nonatomic) IBOutlet UILabel *labelTitle;
@property (weak, nonatomic) IBOutlet UILabel *labelInfo;
@property (weak, nonatomic) IBOutlet UIImageView *imageView;
@property (weak, nonatomic) IBOutlet UIStepper *stepper;
@property (weak, nonatomic) IBOutlet UISlider *slider;
@property (strong,nonatomic) NSArray *imageInfos;
@property (assign,nonatomic) NSInteger index;//显示当前图片的索引
@property (assign,nonatomic) NSInteger total;//图片的个数
@end

@implementation ViewController
- (IBAction)stepperValueChange:(UIStepper *)sender
{
    [self.slider setValue:sender.value];
    self.index = [self.stepper value];
    [self setImageIndex:self.index];
}
- (IBAction)sliderValueChange:(UISlider *)sender
{
    [self.stepper setValue:sender.value];
    self.index = [self.slider value];
    [self setImageIndex:self.index];
}

- (void)viewDidLoad {
    [super viewDidLoad];
    //加载图片信息
    NSString *path = [[NSBundle mainBundle] pathForResource:@"images" ofType:@"plist"];
    self.imageInfos = [NSArray arrayWithContentsOfFile:path];
    
    
    //初始化
    self.total = [self.imageInfos count];
    self.index = 0;
    
    self.stepper.minimumValue = 0;
    self.stepper.maximumValue = self.total - 1;
    self.stepper.value = 0;
    self.stepper.stepValue = 1;
    
    self.slider.minimumValue = 0;
    self.slider.maximumValue = self.total - 1;
    self.slider.value = 0;
    

    self.imageView.contentMode = UIViewContentModeScaleAspectFit;
    [self setImageIndex:0];
    
}

-(void)setImageIndex:(NSUInteger)index
{
    
    //取出数组中的字典
    NSDictionary *dicImage = self.imageInfos[index];
    NSString *imageName = [dicImage objectForKey:@"icon"];
    NSString *imageTitle = [dicImage objectForKey:@"title"];
    
    //设置显示的图片
    self.imageView.image = [UIImage imageNamed:imageName];
    
    //设置显示的图片的标题
    self.labelTitle.text = imageTitle;
    
    //设置当前信息：索引/总数
    self.labelInfo.text = [NSString stringWithFormat:@"%ld/%ld",self.index+1,self.total];
}

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

@end