ios 動畫 彩圖

//
//  ColorView.m
//  MulticolorLayerDemo
//
//  Created by lance on 14-8-1.
//  Copyright (c) 2014年 Liuyu. All rights reserved.
//

#import "ColorView.h"
<img src="https://img-blog.csdn.net/20140801112318109?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvbGFuY2VfbGFu/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast" width="480" height="874" alt="" />
@implementation ColorView

+ (Class)layerClass
{
    return [CAGradientLayer class];
}

- (id)initWithFrame:(CGRect)frame startPoint:(CGPoint)startPoint endPoint:(CGPoint)endPoint
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
        
        _startPoint = startPoint;
        _endPoint = endPoint;
        
        [self setColorView];
        
        self.layer.mask = [self productCircle];
    }
    return self;
}

// 生成一張彩照
- (void)setColorView
{
    CAGradientLayer *gradientlayer = (id)self.layer;

    gradientlayer.startPoint = _startPoint;
    gradientlayer.endPoint = _endPoint;
    
    // 顏色
    NSMutableArray *colors = [NSMutableArray new];
    for (int i = 0; i <= 360; i += 10) {
        [colors addObject:(id)[UIColor colorWithHue:1.0 * i / 360.0 saturation:1.0 brightness:1.0 alpha:1.0].CGColor];
    }
    [gradientlayer setColors:colors];
}

// 畫圓
- (CAShapeLayer *)productCircle
{
    // 圓的路徑
    CGPoint centerPoint = CGPointMake(CGRectGetMidX(self.bounds), CGRectGetMidY(self.bounds));
    CGFloat radius = self.bounds.size.width / 2.0 - 40;
    
    UIBezierPath *bp = [UIBezierPath bezierPathWithArcCenter:centerPoint
                                                      radius:radius
                                                  startAngle:M_PI
                                                    endAngle:-M_PI
                                                   clockwise:YES];
    CAShapeLayer *shapeLayer = [CAShapeLayer layer];
    shapeLayer.path = bp.CGPath;
    shapeLayer.lineWidth = 2.0;
    shapeLayer.strokeColor = [UIColor grayColor].CGColor;
//    shapeLayer.fillColor = [UIColor clearColor].CGColor;
    
    shapeLayer.strokeStart = 0.0;
    shapeLayer.strokeEnd = 1.0;
    
    return shapeLayer;
}

- (void)startAnimation
{
    CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"];
    animation.duration = 4.0f;
    animation.repeatCount = MAXFLOAT;
    animation.fromValue = [NSNumber numberWithFloat:0.0];
    animation.toValue = [NSNumber numberWithFloat:M_PI * 2];
    
    [self.layer addAnimation:animation forKey:@"transform"];
}

- (void)endAnimation
{
    [self.layer removeAnimationForKey:@"transform"];
}

@end