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：