阴影效果片段代码

转http://blog.csdn.net/toddmi/article/details/8133967

给一个对象简单设置阴影效果：

[html] view plaincopy

Lable.shadowColor = color;

Lable.shadowOffset = CGSizeMake(0, -1.0);

或

[html] view plaincopy

UIView *testView = [[UIView alloc] initWithFrame:CGRectMake(30, 30, 130, 130)];

[testView setBackgroundColor:[UIColor grayColor]];

[[testView layer] setShadowOffset:CGSizeMake(15, 15)]; //设置阴影位置相对于Object位置的偏移值

[[testView layer] setShadowRadius:0];

[[testView layer] setShadowOpacity:0.6];

[[testView layer] setShadowColor:[UIColor grayColor].CGColor];

[self.view addSubview:testView];

[testView release];

根据path设置阴影效果：

[html] view plaincopy

#import <QuartzCore/QuartzCore.h>

@implementation UIView (NKShadow)

// add the shadow effect to the view

-(void)addShadow{

self.layer.shadowOpacity = 0.4;

self.layer.shadowRadius = 0.9;

self.layer.shadowOffset = CGSizeMake(0, 0);

UIBezierPath *path = [UIBezierPath bezierPath];

CGPoint p1 = CGPointMake(self.frame.origin.x, self.frame.origin.y+self.frame.size.height);

CGPoint p2 = CGPointMake(self.frame.origin.x+self.frame.size.width, p1.y);

CGPoint c1 = CGPointMake((p1.x+p2.x)/4 , p1.y+6.0);

CGPoint c2 = CGPointMake(c1.x*3, c1.y);

[path moveToPoint:p1];

[path addCurveToPoint:p2 controlPoint1:c1 controlPoint2:c2];

self.layer.shadowPath = path.CGPath;

}

-(void)addGrayGradientShadow{

// 0.8 is a good feeling shadowOpacity

self.layer.shadowOpacity = 0.4;

// The Width and the Height of the shadow rect

CGFloat rectWidth = 10.0;

CGFloat rectHeight = self.frame.size.height;

// Creat the path of the shadow

CGMutablePathRef shadowPath = CGPathCreateMutable();

// Move to the (0, 0) point

CGPathMoveToPoint(shadowPath, NULL, 0.0, 0.0);

// Add the Left and right rect

CGPathAddRect(shadowPath, NULL, CGRectMake(0.0-rectWidth, 0.0, rectWidth, rectHeight));

CGPathAddRect(shadowPath, NULL, CGRectMake(self.frame.size.width, 0.0, rectWidth, rectHeight));

self.layer.shadowPath = shadowPath;

CGPathRelease(shadowPath);

// Since the default color of the shadow is black, we do not need to set it now

//self.layer.shadowColor = [UIColor blackColor].CGColor;

self.layer.shadowOffset = CGSizeMake(0, 0);

// This is very important, the shadowRadius decides the feel of the shadow

self.layer.shadowRadius = 10.0;

}

@end

UIView以外的区域设置阴影效果：

[html] view plaincopy

[[UIColor colorWithWhite:0.0f alpha:0.5f] setFill];//阴影效果 根据透明度来设计

UIRectFill( rect );

CGRect holeRect = CGRectMake(holeX, holeY, holeWidth, holeHeight);//设置透明范围

CGRect holeRectIntersection = CGRectIntersection( holeRect, rect );

[[UIColor clearColor] setFill];

UIRectFill( holeRectIntersection );

UIView设置边框：

[html] view plaincopy

//UIView设置边框

[[testView layer] setCornerRadius:5];

[[testView layer] setBorderWidth:2];

[[testView layer] setBorderColor:[UIColor redColor].CGColor];

拉伸一张图片：

[html] view plaincopy

UIImage *smallImage = [UIImage imageNamed:@"hc_03.png"];

UIImageView *imageView = [[UIImageView alloc] initWithImage:smallImage];

[imageView setFrame:CGRectMake(0, 20, 320, 44)];

imageView.contentMode = UIViewContentModeScaleToFill;

[self.view addSubview:imageView];

[imageView release];