CALayer

1:使用前注意引入以下框架: QuartzCore.framework

2:头部文件引入:  #import <QuartzCore/QuartzCore.h>

1:设置阴影相关

UIColor *color1 =[UIColor colorWithRed:108.0/255 green:108.0/255 blue:108.0/255 alpha:1];
[[viewBox layer] setShadowOffset:CGSizeMake(0, 1)];//水平偏移点, 垂直偏移点
[[viewBox layer] setShadowRadius:1.7f]; //阴影的扩散程度
[[viewBox layer] setShadowOpacity:0.9]; //阴影的深度
[[viewBox layer] setShadowColor:color1.CGColor];//阴影颜色
[[viewBox layer] setShadowPath:[[UIBezierPath bezierPathWithRect:CGRectMake(0, 0, viewBox.frame.size.width, viewBox.frame.size.height)]CGPath]]; //设置阴影的Frame 以View本身为原点坐标,如果没有其他特殊要求,请以划线的方式确认这个Path.

注: 

1:viewBox.layer.masksToBounds = YES;  //如果设置为YES  将无法看到阴影效果.

2: setShadowPath如果不设置,将会严重影响Core Animaction的效果.请特别注意!

3: ShadowPath 设置圆角的方式

[iconShadowView.layer setShadowPath:[UIBezierPath bezierPathWithRoundedRect:(CGRect){0, 0, iconShadowView.frame.size} cornerRadius:10].CGPath];

注:如果添加阴影时 为当前View设置自适应布局变化功能, 需要酌情减去 44 来保证设置Path时的效果.

self.view.autoresizingMask

2:View圆角

viewBox.layer.cornerRadius = 5;

注:如果所设置的View  自定义了 drawRect 方案, 圆角的设置将无效果.  如果设置 masksToBounds 为 YES  可以看到效果

3:masksToBounds 用途

layer的masksToBounds属性决定了sublayer是否被父layer所裁剪，

masksToBounds的默认值是NO，防止sublayer被父layer裁剪。

如图举例:

4:Layer 颜色渐变相关

CAGradientLayer *gradient = [CAGradientLayer layer];
gradient.frame = viewInput.frame;
UIColor *color1 =[UIColor colorWithRed:124.0/255 green:131.0/255 blue:143.0/255 alpha:1];
UIColor *color2 =[UIColor colorWithRed:87.0/255 green:88.0/255 blue:90.0/255 alpha:1];
gradient.colors = [NSArray arrayWithObjects:(id)color1.CGColor,(id)color2.CGColor,nil];
//locations 的设定会使颜色的渐变产生改变,具体细节需要尝试,无法描述.
gradient.locations = [NSArray arrayWithObjects:[NSNumber numberWithFloat:0.1],[NSNumber numberWithFloat:1],nil];
//决定了绘制渐变时方向性. 默认是 由上往下,  可以通过修改产生颜色渐变的倾斜效果
gradient.startPoint = CGPointMake(0, 0);//默认轴为: 0.5 0.0
gradient.endPoint = CGPointMake(1, 1);//默认轴为: 0.5 1.0
[self.viewInput.layer addSublayer:gradient];

5:为View  顶部(top border) 添加 一条线

UIColor *color144 =[UIColor colorWithRed:57.0/255 green:62.0/255 blue:71.0/255 alpha:1];
CALayer *bottomBorder = [CALayer layer];
bottomBorder.frame = CGRectMake(0.0f, 0.0f, self.viewInput.frame.size.width, 1.0f);
bottomBorder.backgroundColor = color144.CGColor;
[self.viewInput.layer addSublayer:bottomBorder];

6:让View去除锯齿效果:

self.layer.shouldRasterize = YES

注: 但是图片可能会失真