custom progress bar for iphone&ipad(转)

Posted by NaveenShan on Wednesday, November 3, 2010 Under: iPhone/iPad

/**************************************************************************************
/*  File Name      : ProgressBar.h
/*  Project Name   : <nil> Generic
/*  Description    : A Custom Progress Bar View
/*  Version        : 1.0
/*  Created by     : Naveen Shan
/*  Created on     : 13/10/10
/*  Copyright (C) 2010 RapidValue IT Services Pvt. Ltd. All Rights Reserved.
/**************************************************************************************/

#import <UIKit/UIKit.h>

@interface ProgressBar : UIView {
    float minValue, maxValue;
    float currentValue;
    UIColor *lineColor, *progressRemainingColor, *progressColor, *textColor;
}

@property (readwrite) float minValue, maxValue, currentValue;
@property (nonatomic, retain) UIColor *lineColor, *progressRemainingColor, *progressColor, *textColor;

-(void)setNewRect:(CGRect)newFrame;

@end

/**************************************************************************************
/*  File Name      : ProgressBar.m
/*  Project Name   : <nil> Generic
/*  Description    : N/A
/*  Version        : 1.0
/*  Created by     : Naveen Shan
/*  Created on     : 13/10/10
/*  Copyright (C) 2010 RapidValue IT Services Pvt. Ltd. All Rights Reserved.
/**************************************************************************************/

#import "ProgressBar.h"

@implementation ProgressBar

#pragma mark -

@synthesize  minValue, maxValue, currentValue;
@synthesize lineColor, progressRemainingColor, progressColor, textColor;

#pragma mark -

- (id)initWithFrame:(CGRect)frame {
    if (self = [super initWithFrame:frame]) {
        minValue = 0;
        maxValue = 1;
        currentValue = 0;
        self.backgroundColor = [UIColor clearColor];
        lineColor = [[UIColor whiteColor] retain];
        textColor = [[UIColor magentaColor] retain];
        progressColor = [[UIColor darkGrayColor] retain];
        progressRemainingColor = [[UIColor lightGrayColor] retain];
    }
    return self;
}

#pragma mark -

- (void)drawRect:(CGRect)rect {
   
    CGContextRef context = UIGraphicsGetCurrentContext();
   
    CGContextSetLineWidth(context, 3);
    CGContextSetStrokeColorWithColor(context,[lineColor CGColor]);
   
    //upper half
    CGContextSetFillColorWithColor(context, [[progressRemainingColor colorWithAlphaComponent:.7] CGColor]);
    CGContextAddRect(context, CGRectMake(2, 2, rect.size.width-4, ((rect.size.height/2)-2)));
    CGContextFillPath(context);
   
    //lower half
    CGContextSetFillColorWithColor(context, [progressRemainingColor CGColor]);
    CGContextAddRect(context, CGRectMake(2, rect.size.height/2-2, rect.size.width-4, ((rect.size.height/2)-2)));
    CGContextFillPath(context);
   
    //border
    CGContextAddRect(context, CGRectMake(0, 0, rect.size.width, rect.size.height-2));
    CGContextStrokePath(context);
   
    //to plot progress
    float amount = (currentValue/(maxValue - minValue)) * (rect.size.width-5);
    CGContextSetFillColorWithColor(context, [progressColor CGColor]);
    CGContextAddRect(context, CGRectMake(2,2, amount, rect.size.height-5));
    CGContextFillPath(context);
   
    //to draw percentage text
    CGContextSetFillColorWithColor(context, [textColor CGColor]);
    CGContextSelectFont(context, "Helvetica", rect.size.height/2, kCGEncodingMacRoman);
    CGContextSetTextMatrix(context, CGAffineTransformMakeScale(1.0, -1.0));
    CGContextSetTextDrawingMode(context, kCGTextFill);
    char str[20];
    sprintf(str, "%d %s" ,(int)currentValue,"%");
    CGContextShowTextAtPoint(context,((rect.size.width/2)-10),rect.size.height/2,str,strlen(str));
}

-(void)setNewRect:(CGRect)newFrame {
    self.frame = newFrame;
    [self setNeedsDisplay];
}

#pragma mark -

-(void)setMinValue:(float)newMin    {
    minValue = newMin;
    [self setNeedsDisplay];
}

-(void)setMaxValue:(float)newMax    {
    maxValue = newMax;
    [self setNeedsDisplay];
}

-(void)setCurrentValue:(float)newValue    {
   
    if(newValue < minValue)
        currentValue = minValue;
    else if(newValue > maxValue)
        currentValue = maxValue;
    else
        currentValue = newValue;
    [self setNeedsDisplay];
}

#pragma mark -

-(void)setLineColor:(UIColor *)newColor    {
    [newColor retain];
    [lineColor release];
    lineColor = newColor;
    [self setNeedsDisplay];
}

-(void)setTextColor:(UIColor *)newColor    {
    [newColor retain];
    [textColor release];
    textColor = newColor;
    [self setNeedsDisplay];
}

-(void)setProgressColor:(UIColor *)newColor    {
    [newColor retain];
    [progressColor release];
    progressColor = newColor;
    [self setNeedsDisplay];
}

-(void)setProgressRemainingColor:(UIColor *)newColor    {
    [newColor retain];
    [progressRemainingColor release];
    progressRemainingColor = newColor;
    [self setNeedsDisplay];
}

#pragma mark -

- (void)dealloc {
    [lineColor release];
    [textColor release];
    [progressColor release];
    [progressRemainingColor release];
    [super dealloc];
}

Call for Custom Progress Bar.
First, Implement the above code as new File
And Call like following,

    ProgressBar *objProgressBar= [[ProgressBar alloc] initWithFrame:CGRectMake(100,100,600,75)];
    objProgressBar.maxValue=100.0;
    objProgressBar.minValue=0.0;
    objProgressBar.lineColor=[UIColor redColor];
    objProgressBar.textColor=[UIColor magentaColor];
    objProgressBar.progressColor=[UIColor greenColor];
    objProgressBar.progressRemainingColor=[UIColor blueColor];
    objProgressBar.currentValue=10.0;
    [self.view addSubview:objProgressBar];
   
    [objProgressBar release];

From:http://www.naveenshan.yolasite.com/blog/custom-slider-for-iphone-ipad