iphone ios layer 教程应用
2011-11-21 19:32
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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:
运行效果图:
给子Layer添加图片
view plaincopy to
clipboardprint?
//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];
[/code]
运行效果:
设置图片为椭圆角,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 clipboardprint?#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]; } @endview plaincopy to clipboardprint? //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]; //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
clipboardprint?
//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];
view plaincopy to clipboardprint?imageLayer.borderColor = [UIColor grayColor].CGColor; //边框颜色 imageLayer.borderWidth = 2.0; //边框宽度 imageLayer.borderColor = [UIColor grayColor].CGColor; //边框颜色 imageLayer.borderWidth = 2.0; //边框宽度
[/code]
运行效果:
设置图片为椭圆角,代码:
view plaincopy to clipboardprint?imageLayer.cornerRadius = 10.0; //设置layer圆角半径 imageLayer.masksToBounds = YES; //隐藏边界view plaincopy to clipboardprint?UIImage *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]; UIImage *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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