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ios CAgrADiEntlAyEr

用CAGradientLayer类来实现 CAGradientLayer *itemChartLayer = [CAGradientLayer layer]; itemChartLayer.colors = @[(__bridge id)startColor.CGColor, (__bridge id)endColor.CGColor]; itemChartLayer.startPoint = CGPointMake(0, 0); item...

1. CAGradientLayer实现渐变 CAGradientLayer是CALayer的一个特殊子类,用于生成颜色渐变的图层,使用较为方便,下面介绍下它的相关属性: colors 渐变的颜色 locations 渐变颜色的分割点 startPoint&endPoint 颜色渐变的方向,范围在(0,0)与(1....

Core Animation里面的CALayer已经被说烂了,这里就不加赘述了。 需要说明两点: 1.Layer跟UIView之间的关系可以这么理解,只有root layer才是真正跟view打交道的,一个view并不代表一个layer; 2.layer的坐标系统,anchorPoint这个是相对于自身...

#import CAGradientLayer *gradient = [CAGradientLayer layer]; gradient.frame = rect; gradient.colors = [NSArray arrayWithObjects:(id)[UIColor redColor].CGColor, (id)[UIColor yellowColor].CGColor, (id)[UIColor greenColor].CGColor...

// 覆盖drawRect方法,你可以在此自定义绘画和动画 - (void)drawRect:(CGRect)rect { //An opaque type that represents a Quartz 2D drawing environment. //一个不透明类型的Quartz 2D绘画环境,相当于一个画布,你可以在上面任意绘画 CGContext...

实现类CustomView.m: [cpp] view plain copy #import "CustomView.h" @implementation CustomView - (id)initWithFrame:(CGRect)frame { self = [super initWithFrame:frame]; if (self) { } return self; } // 覆盖drawRect方法,你可以在此...

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