xcode -饼状进度条

界面搭建

创建一个画饼状的类  eatView 集成UIView

#import "eatView.h"

@implementation eatView

// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
    //创建一个园的风格数组
    NSArray * arr = @[@,@,@,@,@,@,@,@,@,@];

    //计算园的中心点
    CGPoint center = CGPointMake(rect.size.width * 0.5, rect.size.height * 0.5);
    //园的半径
    CGFloat radius = rect.size.width * 0.5 ;
    //开始位置
    CGFloat startA = ;
    //结束位置
    CGFloat endA = ;
    CGFloat angle = ;
    //设置uiView的背景颜色
    self.backgroundColor=[UIColor clearColor];
    //遍历园等分的数组
    for (NSNumber *num in arr) {
        //计算开始位置
        startA = endA;
        //计算弧度
        angle = num.intValue / 100.0 * M_PI *;
        //结束位置
        endA =startA + angle;
        //创建画笔
        UIBezierPath * path = [UIBezierPath bezierPathWithArcCenter:center radius:radius startAngle:startA endAngle:endA clockwise:YES];
        //画一条连接中心的线
        [path addLineToPoint:center];
        //设置随机颜色
        [[self randomColor]set];
        [path fill];
    }
    //创建一个定时器
    CADisplayLink * link =[CADisplayLink displayLinkWithTarget:self selector:@selector(click)];
    //加入主运行时
    [link addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];
    //创建一个定时器
//    [NSTimer scheduledTimerWithTimeInterval:1/50.0 target:self selector:@selector(click) userInfo:nil repeats:YES];
}
/**
 生产随机颜色
 */
- (UIColor *)randomColor{
    return [UIColor colorWithRed:arc4random_uniform()/255.0 green:arc4random_uniform()/255.0 blue:arc4random_uniform()/255.0 alpha:];
}
/**
 重绘图行
 */
-(void)click{
    [self setNeedsDisplay];
}

@end

脱线 一根UITextField 另一根UIView

@property (weak, nonatomic) IBOutlet UITextField *textNum;

@property (weak, nonatomic) IBOutlet UIView *beginView;

拖线 UIButton 点击方法  - (IBAction)beginGoBtn:(id)sender

#import "ViewController.h"

#import "eatView.h"

@interface ViewController ()
@property (weak, nonatomic) IBOutlet UITextField *textNum;
@property (weak, nonatomic) IBOutlet UIView *beginView;

@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.
}

- (IBAction)beginGoBtn:(id)sender {
    //释放加载过得UIview 不然又内存问题
    for (UIView * vol in self.beginView.subviews) {
        [vol removeFromSuperview];
    }
   //关闭键盘
    [self.view endEditing:YES];
    int count=self.textNum.text.intValue;
    for (int i=0; i<count; i++) {
        eatView * eatV = [[eatView alloc]init];

        // 按钮尺寸
        CGFloat optionW = 50;
        CGFloat optionH = 50;
        // 按钮之间的间距
        CGFloat margin = 5;
        // 控制器view的宽度
        CGFloat viewW = self.beginView.frame.size.width;
        // 总列数
        int totalColumns = 6;
        // 最左边的间距 = 0.5 * (控制器view的宽度 - 总列数 * 按钮宽度 - (总列数 - 1) * 按钮之间的间距)
        CGFloat leftMargin = (viewW - totalColumns * optionW - margin * (totalColumns - 1)) * 0.5;
        int col = i % totalColumns;
        // 按钮的x = 最左边的间距 + 列号 * (按钮宽度 + 按钮之间的间距)
        CGFloat optionX = leftMargin + col * (optionW + margin);
        int row = i / totalColumns;
        // 按钮的y = 行号 * (按钮高度 + 按钮之间的间距)
        CGFloat optionY = row * (optionH + margin);
        eatV.frame = CGRectMake(optionX, optionY, optionW, optionH);

        [self.beginView addSubview:eatV];
    }

}

@end

效果图：