iphone ios layer 教程应用
2013-03-13 13:39
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CALayer(层)是屏幕上的一个矩形区域,在每一个UIView中都包含一个根CALayer,在UIView上的所有视觉效果都是在这个Layer上进行的。
CALayer外形特征主要包括:
1、层的大小尺寸
2、背景色
3、内容(可以填充图片或者使用Core Graphics绘制的内容)
4、矩形是否使用圆角
5、矩形是否有阴影
Layer有很多种,最常用也是最基本的是CALayer,当然还包括其他的子类:
CAScrollerLayer 简化显示层的一部分
CATextLayer 文本层
CAGradientLayer、CAShapeLayer等等
使用层之前,需要在项目中引入QuartzCore.framework框架
实例:
新建XCode项目LayerSample,导入QuartzCore.famework
在LayerSampleViewController.h文件中引入:
运行程序:
为了区分背景UIView,我将UIView的背景色设置为白色,backLayer的背景色设置为橘黄色。
上图是一个矩形区域,如果设置矩形的四个角是椭圆角,可以添加属性:
backLayer.cornerRadius = 20.0; //矩形椭圆角的弧度半径
运行程序后,效果如图:
添加带阴影的子Layer(层),代码:
运行效果图:
给子Layer添加图片
view
plaincopy
to clipboard
//添加子image
layer
UIImage
*image =
[UIImage imageNamed:@"feiche.jpg"];
CALayer
*imageLayer =
[CALayer layer];
imageLayer.frame = CGRectMake(100,
100, image.size.width, image.size.height);
imageLayer.contents =
(id) image.CGImage;
imageLayer.shadowOffset = CGSizeMake(0,
3); //设置阴影的偏移量
imageLayer.shadowRadius = 10.0;
//设置阴影的半径
imageLayer.shadowColor =
[UIColor blackColor].CGColor; //设置阴影的颜色为黑色
imageLayer.shadowOpacity = 0.9;
//设置阴影的不透明度
[backLayer
addSublayer:imageLayer];
[html] view
plaincopy
//添加子image layer
UIImage *image = [UIImage imageNamed:@"feiche.jpg"];
CALayer *imageLayer = [CALayer layer];
imageLayer.frame = CGRectMake(100, 100, image.size.width, image.size.height);
imageLayer.contents = (id) image.CGImage;
imageLayer.shadowOffset = CGSizeMake(0, 3); //设置阴影的偏移量
imageLayer.shadowRadius = 10.0; //设置阴影的半径
imageLayer.shadowColor = [UIColor blackColor].CGColor; //设置阴影的颜色为黑色
imageLayer.shadowOpacity = 0.9; //设置阴影的不透明度
[backLayer addSublayer:imageLayer];
运行效果,
图片加边框,代码:
运行效果:
设置图片为椭圆角,代码:
运行效果:
但是由于设置masksToBounds 属性为true所以Layer的阴影效果也就没有了。
之前我都是将图片另外在做有阴影效果的图片,这样显的比较真实,如果阴影部分只是填充边框即可,可以采用两个Layer来实现阴影效果,代码:
运行后效果:
------转自/article/7831249.html
CALayer外形特征主要包括:
1、层的大小尺寸
2、背景色
3、内容(可以填充图片或者使用Core Graphics绘制的内容)
4、矩形是否使用圆角
5、矩形是否有阴影
Layer有很多种,最常用也是最基本的是CALayer,当然还包括其他的子类:
CAScrollerLayer 简化显示层的一部分
CATextLayer 文本层
CAGradientLayer、CAShapeLayer等等
使用层之前,需要在项目中引入QuartzCore.framework框架
实例:
新建XCode项目LayerSample,导入QuartzCore.famework
在LayerSampleViewController.h文件中引入:
view plaincopy to clipboard#import <QuartzCore/QuartzCore.h> LayerSampleViewController.m文件,代码: // // LayerSampleViewController.m // LayerSample // // Created by jordy on 11-3-28. // Copyright 2011 vsp. All rights reserved. // #import "LayerSampleViewController.h" @implementation LayerSampleViewController // Implement loadView to create a view hierarchy programmatically, without using a nib. - (void)loadView { UIView *rootView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 1024, 768)]; rootView.backgroundColor = [UIColor whiteColor]; self.view = rootView; [rootView release]; //加载layer backLayer = [CALayer layer]; backLayer.backgroundColor = [UIColor orangeColor].CGColor; backLayer.bounds = CGRectMake(10, 10, 1004, 728); //设置layer的区域 backLayer.position = CGPointMake(1024/2, 768/2-10); //设置layer坐标 [self.view.layer addSublayer:backLayer]; } // Override to allow orientations other than the default portrait orientation. - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { return interfaceOrientation == UIInterfaceOrientationLandscapeLeft; } - (void)didReceiveMemoryWarning { // Releases the view if it doesn't have a superview. [super didReceiveMemoryWarning]; // Release any cached data, images, etc that aren't in use. } - (void)viewDidUnload { // Release any retained subviews of the main view. // e.g. self.myOutlet = nil; } - (void)dealloc { [super dealloc]; } @end [html] view plaincopy#import <QuartzCore/QuartzCore.h> LayerSampleViewController.m文件,代码: // // LayerSampleViewController.m // LayerSample // // Created by jordy on 11-3-28. // Copyright 2011 vsp. All rights reserved. // #import "LayerSampleViewController.h" @implementation LayerSampleViewController // Implement loadView to create a view hierarchy programmatically, without using a nib. - (void)loadView { UIView *rootView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 1024, 768)]; rootView.backgroundColor = [UIColor whiteColor]; self.view = rootView; [rootView release]; //加载layer backLayer = [CALayer layer]; backLayer.backgroundColor = [UIColor orangeColor].CGColor; backLayer.bounds = CGRectMake(10, 10, 1004, 728); //设置layer的区域 backLayer.position = CGPointMake(1024/2, 768/2-10); //设置layer坐标 [self.view.layer addSublayer:backLayer]; } // Override to allow orientations other than the default portrait orientation. - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { return interfaceOrientation == UIInterfaceOrientationLandscapeLeft; } - (void)didReceiveMemoryWarning { // Releases the view if it doesn't have a superview. [super didReceiveMemoryWarning]; // Release any cached data, images, etc that aren't in use. } - (void)viewDidUnload { // Release any retained subviews of the main view. // e.g. self.myOutlet = nil; } - (void)dealloc { [super dealloc]; } @end
运行程序:
为了区分背景UIView,我将UIView的背景色设置为白色,backLayer的背景色设置为橘黄色。
上图是一个矩形区域,如果设置矩形的四个角是椭圆角,可以添加属性:
backLayer.cornerRadius = 20.0; //矩形椭圆角的弧度半径
运行程序后,效果如图:
添加带阴影的子Layer(层),代码:
view plaincopy to clipboard //添加子layer CALayer *cyanLayer = [CALayer layer]; cyanLayer.backgroundColor = [UIColor cyanColor].CGColor; cyanLayer.bounds = CGRectMake(0, 0, 300, 300); cyanLayer.position = CGPointMake(180, 180); cyanLayer.shadowOffset = CGSizeMake(0, 3); //设置阴影的偏移量 cyanLayer.shadowRadius = 10.0; //设置阴影的半径 cyanLayer.shadowColor = [UIColor blackColor].CGColor; //设置阴影的颜色为黑色 cyanLayer.shadowOpacity = 0.9; //设置阴影的不透明度 [backLayer addSublayer:cyanLayer]; [html] view plaincopy //添加子layer CALayer *cyanLayer = [CALayer layer]; cyanLayer.backgroundColor = [UIColor cyanColor].CGColor; cyanLayer.bounds = CGRectMake(0, 0, 300, 300); cyanLayer.position = CGPointMake(180, 180); cyanLayer.shadowOffset = CGSizeMake(0, 3); //设置阴影的偏移量 cyanLayer.shadowRadius = 10.0; //设置阴影的半径 cyanLayer.shadowColor = [UIColor blackColor].CGColor; //设置阴影的颜色为黑色 cyanLayer.shadowOpacity = 0.9; //设置阴影的不透明度 [backLayer addSublayer:cyanLayer];
运行效果图:
给子Layer添加图片
view
plaincopy
to clipboard
//添加子image
layer
UIImage
*image =
[UIImage imageNamed:@"feiche.jpg"];
CALayer
*imageLayer =
[CALayer layer];
imageLayer.frame = CGRectMake(100,
100, image.size.width, image.size.height);
imageLayer.contents =
(id) image.CGImage;
imageLayer.shadowOffset = CGSizeMake(0,
3); //设置阴影的偏移量
imageLayer.shadowRadius = 10.0;
//设置阴影的半径
imageLayer.shadowColor =
[UIColor blackColor].CGColor; //设置阴影的颜色为黑色
imageLayer.shadowOpacity = 0.9;
//设置阴影的不透明度
[backLayer
addSublayer:imageLayer];
[html] view
plaincopy
//添加子image layer
UIImage *image = [UIImage imageNamed:@"feiche.jpg"];
CALayer *imageLayer = [CALayer layer];
imageLayer.frame = CGRectMake(100, 100, image.size.width, image.size.height);
imageLayer.contents = (id) image.CGImage;
imageLayer.shadowOffset = CGSizeMake(0, 3); //设置阴影的偏移量
imageLayer.shadowRadius = 10.0; //设置阴影的半径
imageLayer.shadowColor = [UIColor blackColor].CGColor; //设置阴影的颜色为黑色
imageLayer.shadowOpacity = 0.9; //设置阴影的不透明度
[backLayer addSublayer:imageLayer];
运行效果,
图片加边框,代码:
view plaincopy to clipboardimageLayer.borderColor = [UIColor grayColor].CGColor; //边框颜色 imageLayer.borderWidth = 2.0; //边框宽度 [html] view plaincopyimageLayer.borderColor = [UIColor grayColor].CGColor; //边框颜色 imageLayer.borderWidth = 2.0; //边框宽度
运行效果:
设置图片为椭圆角,代码:
view plaincopy to clipboardimageLayer.cornerRadius = 10.0; //设置layer圆角半径 imageLayer.masksToBounds = YES; //隐藏边界 [html] view plaincopyimageLayer.cornerRadius = 10.0; //设置layer圆角半径 imageLayer.masksToBounds = YES; //隐藏边界
运行效果:
但是由于设置masksToBounds 属性为true所以Layer的阴影效果也就没有了。
之前我都是将图片另外在做有阴影效果的图片,这样显的比较真实,如果阴影部分只是填充边框即可,可以采用两个Layer来实现阴影效果,代码:
view plaincopy to clipboardUIImage *image = [UIImage imageNamed:@"feiche.jpg"]; //阴影layer CALayer *shadowLayer = [CALayer layer]; shadowLayer.frame = CGRectMake(100, 100, image.size.width, image.size.height); shadowLayer.backgroundColor = [UIColor blueColor].CGColor; shadowLayer.shadowOffset = CGSizeMake(0, 3); shadowLayer.cornerRadius = 10.0; shadowLayer.shadowRadius = 10.0; shadowLayer.shadowColor = [UIColor blackColor].CGColor; //设置阴影的颜色为黑色 shadowLayer.shadowOpacity = 1.0; //设置阴影的不透明度 [backLayer addSublayer:shadowLayer]; //添加子image layer CALayer *imageLayer = [CALayer layer]; imageLayer.frame = CGRectMake(100, 100, image.size.width, image.size.height); imageLayer.contents = (id) image.CGImage; imageLayer.cornerRadius = 10.0; //设置layer圆角半径 imageLayer.masksToBounds = YES; //隐藏边界 imageLayer.borderColor = [UIColor grayColor].CGColor; //边框颜色 imageLayer.borderWidth = 2.0; [backLayer addSublayer:imageLayer]; [html] view plaincopyUIImage *image = [UIImage imageNamed:@"feiche.jpg"]; //阴影layer CALayer *shadowLayer = [CALayer layer]; shadowLayer.frame = CGRectMake(100, 100, image.size.width, image.size.height); shadowLayer.backgroundColor = [UIColor blueColor].CGColor; shadowLayer.shadowOffset = CGSizeMake(0, 3); shadowLayer.cornerRadius = 10.0; shadowLayer.shadowRadius = 10.0; shadowLayer.shadowColor = [UIColor blackColor].CGColor; //设置阴影的颜色为黑色 shadowLayer.shadowOpacity = 1.0; //设置阴影的不透明度 [backLayer addSublayer:shadowLayer]; //添加子image layer CALayer *imageLayer = [CALayer layer]; imageLayer.frame = CGRectMake(100, 100, image.size.width, image.size.height); imageLayer.contents = (id) image.CGImage; imageLayer.cornerRadius = 10.0; //设置layer圆角半径 imageLayer.masksToBounds = YES; //隐藏边界 imageLayer.borderColor = [UIColor grayColor].CGColor; //边框颜色 imageLayer.borderWidth = 2.0; [backLayer addSublayer:imageLayer];
运行后效果:
------转自/article/7831249.html
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