辞客堂数位杂谈版 2018-03-01
基于UIView类:WKJBatteryView
WKJBatteryView.h
#import <UIKit/UIKit.h> @interface WKJBatteryView : UIView /** value:0 - 100 */ - (void)setBatteryValue:(NSInteger)value; @end
WKJBatteryView.m
#import "WKJBatteryView.h" @interface WKJBatteryView() ///电池宽度 @property (nonatomic,assign) CGFloat b_width; ///电池高度 @property (nonatomic,assign) CGFloat b_height; ///电池外线宽 @property (nonatomic,assign) CGFloat b_lineW; @property (nonatomic,strong) UIView *batteryView; @end @implementation WKJBatteryView - (instancetype)initWithFrame:(CGRect)frame{ self = [super initWithFrame:frame]; if (self) { [self drawBattery]; } return self; } ///画图标 - (void)drawBattery{ ///x坐标 CGFloat b_x = 1; ///y坐标 CGFloat b_y = 1; _b_height = self.bounds.size.height - 2; _b_width = self.bounds.size.width - 5; _b_lineW = 1; //画电池【左边电池】 UIBezierPath *pathLeft = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(b_x, b_y, _b_width, _b_height) cornerRadius:2]; CAShapeLayer *batteryLayer = [CAShapeLayer layer]; batteryLayer.lineWidth = _b_lineW; batteryLayer.strokeColor = [UIColor lightGrayColor].CGColor; batteryLayer.fillColor = [UIColor clearColor].CGColor; batteryLayer.path = [pathLeft CGPath]; [self.layer addSublayer:batteryLayer]; //画电池【右边电池箭头】 UIBezierPath *pathRight = [UIBezierPath bezierPath]; [pathRight moveToPoint:CGPointMake(b_x + _b_width+1, b_y + _b_height/3)]; [pathRight addLineToPoint:CGPointMake(b_x + _b_width+1, b_y + _b_height * 2/3)]; CAShapeLayer *layerRight = [CAShapeLayer layer]; layerRight.lineWidth = 2; layerRight.strokeColor = [UIColor lightGrayColor].CGColor; layerRight.fillColor = [UIColor clearColor].CGColor; layerRight.path = [pathRight CGPath]; [self.layer addSublayer:layerRight]; ///电池内填充 _batteryView = [[UIView alloc]initWithFrame:CGRectMake(b_x + 1,b_y + _b_lineW, 0, _b_height - _b_lineW * 2)]; _batteryView.layer.cornerRadius = 2; _batteryView.backgroundColor = [UIColor colorWithRed:0.324 green:0.941 blue:0.413 alpha:1.000]; [self addSubview:_batteryView]; } ///控制电量显示 - (void)setBatteryValue:(NSInteger)value{ if (value<10) { _batteryView.backgroundColor = [UIColor redColor]; }else{ _batteryView.backgroundColor = [UIColor colorWithRed:0.324 green:0.941 blue:0.413 alpha:1.000]; } CGRect rect = _batteryView.frame; rect.size.width = (value*(_b_width - _b_lineW * 2))/100; _batteryView.frame = rect; } @end
有人说,制造业正在发生根本性的转变。这种对未来的愿景预计将成为一个工业场所,在这里,连接互联网的机器将模仿人类,但比人类更精确,更快,更便宜地完成工作。宾夕法尼亚大学研究人员有效地制作出了高功率电池。