ios 学习之你画我话绘图六 矩形

    

//创建画布

    CGContextRef currentContext =UIGraphicsGetCurrentContext();

    //创建图形可变路径句柄

    CGMutablePathRef path =CGPathCreateMutable();

    //设置矩形的边界

    CGRect rectangle = CGRectMake(50.0f,50.0f,200.0f, 300.0f);

    //添加矩形到路径中

    CGPathAddRect(path,NULL, rectangle);

    //添加路径到上下文中

    CGContextAddPath(currentContext, path);

    //填充颜色

    [[UIColor colorWithRed:0.20fgreen:0.60fblue:0.80falpha:1.0f]setFill];

    //设置画笔颜色

    [[UIColor redColor]setStroke];

    //设置边框线条宽度

    CGContextSetLineWidth(currentContext,5.0f);

    //画图

    CGContextDrawPath(currentContext,kCGPathFillStroke);

    /* 释放路径 */

    CGPathRelease(path);

   // UIGraphicsGetCurrentContext()

///////////////////////////////////////////////////////////////////////////////////////////////UIColor SDK//////////////////////////////////////////////////////////////////////////////////

//

//  UIColor.h

//  UIKit

//

//  Copyright (c) 2005-2013, Apple Inc. All rights reserved.

//

#import <Foundation/Foundation.h>

#import <CoreGraphics/CoreGraphics.h>

#import <CoreImage/CoreImage.h>

#import <UIKit/UIKitDefines.h>

@class UIImage;

NS_CLASS_AVAILABLE_IOS(2_0) @interface UIColor : NSObject <NSSecureCoding,NSCopying> {

  @private

}

// Convenience methods for creating autoreleased colors

+ (UIColor *)colorWithWhite:(CGFloat)white alpha:(CGFloat)alpha;

+ (UIColor *)colorWithHue:(CGFloat)hue saturation:(CGFloat)saturation brightness:(CGFloat)brightness alpha:(CGFloat)alpha;

+ (UIColor *)colorWithRed:(CGFloat)red green:(CGFloat)green blue:(CGFloat)blue alpha:(CGFloat)alpha;

+ (UIColor *)colorWithCGColor:(CGColorRef)cgColor;

+ (UIColor *)colorWithPatternImage:(UIImage *)image;

+ (UIColor *)colorWithCIColor:(CIColor *)ciColor NS_AVAILABLE_IOS(5_0);

// Initializers for creating non-autoreleased colors

- (UIColor *)initWithWhite:(CGFloat)white alpha:(CGFloat)alpha;

- (UIColor *)initWithHue:(CGFloat)hue saturation:(CGFloat)saturation brightness:(CGFloat)brightness alpha:(CGFloat)alpha;

- (UIColor *)initWithRed:(CGFloat)red green:(CGFloat)green blue:(CGFloat)blue alpha:(CGFloat)alpha;

- (UIColor *)initWithCGColor:(CGColorRef)cgColor;

- (UIColor *)initWithPatternImage:(UIImage*)image;

- (UIColor *)initWithCIColor:(CIColor *)ciColor NS_AVAILABLE_IOS(5_0);

// Some convenience methods to create colors.  These colors will be as calibrated as possible.

// These colors are cached.

+ (UIColor *)blackColor;      // 0.0 white 

+ (UIColor *)darkGrayColor;   // 0.333 white 

+ (UIColor *)lightGrayColor;  // 0.667 white 

+ (UIColor *)whiteColor;      // 1.0 white 

+ (UIColor *)grayColor;       // 0.5 white 

+ (UIColor *)redColor;        // 1.0, 0.0, 0.0 RGB 

+ (UIColor *)greenColor;      // 0.0, 1.0, 0.0 RGB 

+ (UIColor *)blueColor;       // 0.0, 0.0, 1.0 RGB 

+ (UIColor *)cyanColor;       // 0.0, 1.0, 1.0 RGB 

+ (UIColor *)yellowColor;     // 1.0, 1.0, 0.0 RGB 

+ (UIColor *)magentaColor;    // 1.0, 0.0, 1.0 RGB 

+ (UIColor *)orangeColor;     // 1.0, 0.5, 0.0 RGB 

+ (UIColor *)purpleColor;     // 0.5, 0.0, 0.5 RGB 

+ (UIColor *)brownColor;      // 0.6, 0.4, 0.2 RGB 

+ (UIColor *)clearColor;     // 0.0 white, 0.0 alpha 

// Set the color: Sets the fill and stroke colors in the current drawing context. Should be implemented by subclassers.

- (void)set;  //设置填充和画笔颜色

// Set the fill or stroke colors individually. These should be implemented by subclassers.

- (void)setFill;  //设置填充颜色

- (void)setStroke;  //设置画笔颜色

// Convenience methods for getting components.

// If the receiver is of a compatible color space, any non-NULL parameters are populated and 'YES' is returned. Otherwise, the parameters are left unchanged and 'NO' is returned.

- (BOOL)getWhite:(CGFloat *)white alpha:(CGFloat *)alpha NS_AVAILABLE_IOS(5_0);

- (BOOL)getHue:(CGFloat *)hue saturation:(CGFloat *)saturation brightness:(CGFloat *)brightness alpha:(CGFloat *)alpha NS_AVAILABLE_IOS(5_0);

- (BOOL)getRed:(CGFloat *)red green:(CGFloat *)green blue:(CGFloat *)blue alpha:(CGFloat *)alpha NS_AVAILABLE_IOS(5_0);

// Returns a color in the same color space as the receiver with the specified alpha component.

- (UIColor *)colorWithAlphaComponent:(CGFloat)alpha;

// Access the underlying CGColor or CIColor.

@property(nonatomic,readonly) CGColorRef CGColor;

- (CGColorRef)CGColor NS_RETURNS_INNER_POINTER;

@property(nonatomic,readonly) CIColor   *CIColor NS_AVAILABLE_IOS(5_0);

@end

@interface CIColor(UIKitAdditions)

- (id)initWithColor:(UIColor *)color NS_AVAILABLE_IOS(5_0);

@end