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iOS Quartz2D模拟下载进度条

2024-10-21 15:33:39   213人阅读

效果图：

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步骤：

　　1.在StoryBoard中拖入一个控制器添加UISlider和UIView 2个控件

　　2.在控制器中连线监听UISlider的值变化事件、HJProgressView属性,把变化的值传递给自定义UIView

　　3.自定义HJProgressView重写progressValue属性set方法,重绘视图中得文字和弧度值

 

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控制器代码：

#import "ViewController.h"#import "HJProgressView.h"@interface ViewController ()@property (nonatomic,strong) IBOutlet HJProgressView *progressView;- (IBAction)didSliderValueChange:(UISlider *)sender;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}/** *  sender.value值 0.0~1.0 * *  @param sender <#sender description#> */- (IBAction)didSliderValueChange:(UISlider *)sender {    NSLog(@"%f",sender.value);    self.progressView.progressValue = http://www.mamicode.com/sender.value;>

 

自定义视图代码：

////  HJProgressView.m//  画进度条////  Created by HJiang on 15/1/2.//  Copyright (c) 2015年 HJiang. All rights reserved.//#import "HJProgressView.h"@interface HJProgressView()// 定义属性保存上次的弧度起始//@property (nonatomic,assign) CGFloat endAngle;@end@implementation HJProgressView- (void)setProgressValue:(float)progressValue{    _progressValue = http://www.mamicode.com/progressValue;"%.02f",self.progressValue];    // 输出进度百分比数字    NSMutableString *progressText = [NSMutableString string];    [progressText appendFormat:@"%.01f",self.progressValue * 100];    [progressText appendString:@"%"];        // 控制文字字体大小和颜色属性     NSDictionary *attrs = @{NSFontAttributeName:[UIFont systemFontOfSize:10],NSForegroundColorAttributeName:[UIColor redColor]};    [progressText drawInRect:CGRectMake(x, y, w, h) withAttributes:attrs];        CGContextRef ctx = UIGraphicsGetCurrentContext();    // 设置颜色    CGContextSetRGBStrokeColor(ctx, 0.5, 0.5, 0.5, 1);        // 设置线条大小    CGContextSetLineWidth(ctx, 3);        // 2.绘制弧形进度    CGFloat endAngle = self.progressValue * 2 * M_PI - M_PI_4;        CGContextAddArc(ctx, 30, 30, 25,-M_PI_4, endAngle, 0);        CGContextStrokePath(ctx);    }@end

 

iOS Quartz2D模拟下载进度条


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