UISlider_滑块

/
//  SecondViewController.m
//  UISlider_滑块
//
//  Created by apple on 15/11/20.
//  Copyright © 2015年

shuo. All rights reserved.
//

#import

"SecondViewController.h"

@interface

SecondViewController
()
@property(nonatomic,retain)UILabel
*sliderValueLabel;//显示

value值
@property(nonatomic,retain)UISlider
*slider;//滚动条
@property(nonatomic,retain)UILabel
*xLabel;//文字标签
@property(assign,nonatomic)CGFloat
initialFontSize;//文字缩放尺寸

@end

@implementation
SecondViewController

- (void)viewDidLoad {

    [super

viewDidLoad];

   

   
self.view.backgroundColor
=[UIColor

whiteColor];

   
UIButton*button1 =[UIButton

buttonWithType:UIButtonTypeCustom];

    button1.frame=CGRectMake(100,570,180,30);

    [button1
setTitle:@"回到主页"forState:UIControlStateNormal];

    button1.backgroundColor=[UIColor

purpleColor];

    [self.view

addSubview:button1];

    [button1
addTarget:self

action:@selector(buttonAction1:)forControlEvents:UIControlEventTouchUpInside];

   
//---------------------------------------------------------------

  

       
//显示

sliders
值的
label

   
self.sliderValueLabel
=[[UILabel

alloc]initWithFrame:CGRectMake(20,

30,

30,

30)];

   
self.sliderValueLabel.backgroundColor
=[UIColor

cyanColor];

   
self.sliderValueLabel.text
=@"0";

    [self.view

addSubview:self.sliderValueLabel];

   

   
self.slider
=[[UISlider

alloc]initWithFrame:CGRectMake(100,

30,

200,

40)];

   
self.slider.minimumValue
=
0;//最小值

   
self.slider.maximumValue
=
25;//最大值

   
self.slider.thumbTintColor
=[UIColor

colorWithRed:arc4random()%256/255.0

green:arc4random()%256/255.0

blue:arc4random()%256/255.0

alpha:1.0];

   

    [self.slider

addTarget:self

action:@selector(sliderValueChange)

forControlEvents:UIControlEventValueChanged];

   

    [self.view

addSubview:self.slider];

   
//---------------------文字标签-------------------------------

   

   
self.xLabel
=[[UILabel

alloc]initWithFrame:CGRectMake(0,

100,

375,

400)];

   
self.xLabel.backgroundColor
=[UIColor 

cyanColor];

   
self.xLabel.text
=@"提莫";

   
//--????????————————标签文字居中貌似被废---

    

self.xLabel.textAlignment
=
UITextAlignmentCenter;

   
self.initialFontSize
=self.xLabel.font.pointSize;

   
NSLog(@"initialFontSize  =%.2f",self.initialFontSize);

    [self.view

addSubview:self.xLabel];

   }

- (void)sliderValueChange{

   
NSLog(@"sliderValueChange");

   
//更新sliderValueChange

的值

   
self.sliderValueLabel.text
=[[NSString

alloc]initWithFormat:@"%.0f",self.slider.value];

   
//缩放

xlabel
内容

   
CGFloat
newFontSize =self.initialFontSize*(self.slider.value
+1);

   
NSLog(@"newFontSize =%.2f",newFontSize);

   

   
self.xLabel.font
= [self.xLabel.font

fontWithSize:newFontSize];

   

   

   

   

   

}

    -(void)dealloc{

       

        [_sliderValueLabel

release];

        [_slider

release];

        [_xLabel

release];

        [super

dealloc];

       

}

- (void)buttonAction1:(UIButton*)btn{

  

    [self

dismissViewControllerAnimated:YES

completion:^{

       

       
NSLog(@"回到主页");

    }];

   

  

//控制标签的

value更新

   
UISlider
*sli1 =(UISlider
*)sli;

  
self.label.text
=[NSString
stringWithFormat:@"%.2f",sli1.value];

   

}