IOS开发-利用绘图表示进度

来源：互联网发布：复杂网络画图编辑：程序博客网时间：2024/05/16 11:35

(1)创建自定义view。
(2)导入QuartzCore框架
(3)在h文件，定义一个属性，用于接收进度值，最大值是1，最小值是0:

#import <UIKit/UIKit.h>@interface ZCView : UIView@property(nonatomic,assign)CGFloat progress;@end

(4)m文件的代码如下:

#import "ZCView.h"#import <QuartzCore/QuartzCore.h>@interface ZCView ()@property(nonatomic,weak)UILabel *progressLabel;@end@implementation ZCView- (instancetype)initWithFrame:(CGRect)frame{    self = [super initWithFrame:frame];    if(self)    {        CGFloat proX = 0;        CGFloat proW = frame.size.width;        CGFloat proH = 20;        CGFloat proY = (frame.size.height-proH)/2;        UILabel *progressLabel = [[UILabel alloc]initWithFrame:CGRectMake(proX, proY, proW, proH)];        [progressLabel setTextAlignment:NSTextAlignmentCenter];        self.progressLabel = progressLabel;        [self addSubview:progressLabel];    }    return self;}- (void)drawRect:(CGRect)rect {    //线宽    CGFloat lineWidth = 5;    //半径    CGFloat radius = (rect.size.width-lineWidth*4)/2;    //圆心    CGPoint center = CGPointMake(rect.size.width/2, rect.size.width/2);    //结束弧度    CGFloat endAngle = -M_PI_2+(_progress*M_PI*2);    //路径    UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:center radius:radius startAngle:-M_PI_2 endAngle:endAngle clockwise:YES];    [path setLineWidth:lineWidth];    [path stroke];}- (void)setProgress:(CGFloat)progress{    _progress = progress;    [self.progressLabel setText:[NSString stringWithFormat:@"%.2f%%",progress*100]];    [self setNeedsDisplay];}@end

传入progress的值就能刷新进度了:
这里写图片描述

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