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:0.20f green:0.60f blue:0.80f alpha: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

#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

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