Will的部落格

此範例目的為滑動UISlider, 並顯示此音量控制元件的數值

1. stroryboard中加入slider, label

2. 加入程式關聯性

@property (weak, nonatomic) IBOutletUILabel *valueLabel;
property (weak, nonatomic) IBOutletUISlider *mySlider;
- (IBAction)sliderValueChange:(id)sender;

3.當slider中的值改變, 更新label顯示的數值

- (IBAction)sliderValueChange:(id)sender {

    _valueLabel.text = [NSStringstringWithFormat:@"%.2f", _mySlider.value];

}

//viewcontroller.m程式碼如下

#import "ViewController.h"

@interfaceViewController ()

@property (weak, nonatomic) IBOutletUISlider *mySlider;
- (IBAction)sliderValueChange:(id)sender;
@property (weak, nonatomic) IBOutletUILabel *valueLabel;

@end

@implementation ViewController

- (IBAction)mySlider:(id)sender
{

}

- (IBAction)sliderValueChange:(id)sender {

    _valueLabel.text = [NSStringstringWithFormat:@"%.2f", _mySlider.value];

}

@end

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