1、在DrawLine.h文件中提供了一个改变电池电量数值的接口
//
// DrawLine.h
// Demo-draw2
//
// Created by yyt on 16/5/11.
// Copyright © 2016年 yyt. All rights reserved.
//
#import <UIKit/UIKit.h>
@interface DrawLine : UIView
@property(nonatomic,assign) NSInteger currentNum;
@end
2、在DrawLine.m文件中
//
// DrawLine.m
// Demo-draw2
//
// Created by yyt on 16/5/11.
// Copyright © 2016年 yyt. All rights reserved.
//
#import "DrawLine.h"
@implementation DrawLine
- (void)drawRect:(CGRect)rect {
CGContextRef bgContextRef = UIGraphicsGetCurrentContext();
CGRect frame = CGRectMake(10, 10, 40, 20);
CGContextAddRect(bgContextRef, frame);
CGContextSetLineWidth(bgContextRef, 2);
[commonBgColor setStroke];
CGContextStrokePath(bgContextRef);
CGContextMoveToPoint(bgContextRef, 50, 20);
CGContextAddLineToPoint(bgContextRef, 54, 20);
CGContextSetLineWidth(bgContextRef, 6);
CGContextStrokePath(bgContextRef);
CGContextMoveToPoint(bgContextRef, 10, 20);
CGContextAddLineToPoint(bgContextRef, 10+_currentNum*40/100, 20);
CGContextSetLineWidth(bgContextRef, 20);
CGContextStrokePath(bgContextRef);
}
@end
3、在需要用的地方ViewController.m文件中
我这里是写了个死数据，真正做项目的话，就需要在电量值发生改变的时候，修改currentNum值，然后setNeedsDisplay一下。
//
// ViewController.m
// Demo-draw2
//
// Created by yyt on 16/5/11.
// Copyright © 2016年 yyt. All rights reserved.
//
#import "ViewController.h"
#import "DrawLine.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor lightGrayColor];
DrawLine *lineView = [[DrawLine alloc] initWithFrame:CGRectMake(100, 100, 200, 200)];
lineView.backgroundColor = [UIColor whiteColor];
lineView.currentNum = 87;
[self.view addSubview:lineView];
}
@end