封装CoreGraphics的API简化绘图操作

- (void)drawStrokeBlock:(CGContextObjectDrawBlock_t)block closePath:(BOOL)closePath; * 填充区域用block (beginPath + closePath + 你绘制的代码 + fillPath) * @param block 绘制用block * @param closePath 是否关闭曲线 - (void)drawFillBlock:(CGContextObjectDrawBlock_t)block closePath:(BOOL)closePath; * 绘制加填充 * @param block 绘制用block * @param closePath 是否关闭曲线 - (void)drawStrokeAndFillBlock:(CGContextObjectDrawBlock_t)block closePath:(BOOL)closePath; #pragma mark - 绘制图片API - (void)drawImage:(UIImage *)image atPoint:(CGPoint)point; - (void)drawImage:(UIImage *)image atPoint:(CGPoint)point blendMode:(CGBlendMode)blendMode alpha:(CGFloat)alpha; - (void)drawImage:(UIImage *)image inRect:(CGRect)rect; - (void)drawImage:(UIImage *)image inRect:(CGRect)rect blendMode:(CGBlendMode)blendMode alpha:(CGFloat)alpha; - (void)drawImage:(UIImage *)image asPatternInRect:(CGRect)rect; #pragma mark - 保存操作 * 将当前设置存取到栈区中(入栈操作) - (void)saveStateToStack; * 从栈区中取出之前保存的设置(出栈操作) - (void)restoreStateFromStack; #pragma mark - 图形绘制API * 移动到起始点 * @param point 起始点 - (void)moveToStartPoint:(CGPoint)point; * 添加一个点(与上一个点直线相连) * @param point 点 - (void)addLineToPoint:(CGPoint)point; * 添加二次贝塞尔曲线 * @param point 结束点 * @param pointOne 控制点1 * @param pointTwo 控制点2 - (void)addCurveToPoint:(CGPoint)point controlPointOne:(CGPoint)pointOne controlPointTwo:(CGPoint)pointTwo; * 添加一次贝塞尔曲线 * @param point 结束点 * @param controlPoint 控制点 - (void)addQuadCurveToPoint:(CGPoint)point controlPoint:(CGPoint)controlPoint; * 在指定的区域填充彩色的矩形（此为直接绘制） * @param rect 指定的区域 * @param gradientColor 渐变色对象 - (void)drawLinearGradientAtClipToRect:(CGRect)rect gradientColor:(GradientColor *)gradientColor; #pragma mark - * 添加一个矩形 * @param rect - (void)addRect:(CGRect)rect; * 在给定的矩形中绘制椭圆 * @param rect - (void)addEllipseInRect:(CGRect)rect; * 将string绘制在指定的点上 * @param string 字符串 * @param point 点 * @param attributes 富文本设置（可以为空） - (void)drawString:(NSString *)string atPoint:(CGPoint)point withAttributes:(NSDictionary *)attributes; * 将string绘制在制定的区域 * @param string 字符串 * @param rect 区域 * @param attributes 富文本设置（可以为空） - (void)drawString:(NSString *)string inRect:(CGRect)rect withAttributes:(NSDictionary *)attributes; * 将富文本绘制在制定的点上 * @param string 富文本 * @param point 点 - (void)drawAttributedString:(NSAttributedString *)string atPoint:(CGPoint)point; * 将富文本绘制在制定的矩形中 * @param string 富文本 * @param rect 矩形 - (void)drawAttributedString:(NSAttributedString *)string inRect:(CGRect)rect; @end

//

// CGContextObject.m

// DrawRect

// Created by YouXianMing on 15/7/2.

// Copyright (c) 2015年 YouXianMing. All rights reserved.

#import "CGContextObject.h"

@interface CGContextObject ()

@implementation CGContextObject

- (instancetype)initWithCGContext:(CGContextRef)context {

 self = [super init];

 if (self) {

 self.context = context;

 return self;

- (void)moveToStartPoint:(CGPoint)point {

 if (_context) {

 CGContextMoveToPoint(_context, point.x, point.y);

- (void)addLineToPoint:(CGPoint)point {

 if (_context) {

 CGContextAddLineToPoint(_context, point.x, point.y);

- (void)addCurveToPoint:(CGPoint)point controlPointOne:(CGPoint)pointOne controlPointTwo:(CGPoint)pointTwo {

 if (_context) {

 CGContextAddCurveToPoint(_context, pointOne.x, pointOne.y, pointTwo.x, pointTwo.y, point.x, point.y);

- (void)addQuadCurveToPoint:(CGPoint)point controlPoint:(CGPoint)controlPoint {

 if (_context) {

 CGContextAddQuadCurveToPoint(_context, controlPoint.x, controlPoint.y, point.x, point.y);

- (void)drawLinearGradientAtClipToRect:(CGRect)rect gradientColor:(GradientColor *)gradientColor {

 [self saveStateToStack];


 gradientColor.gradientStartPoint,

 gradientColor.gradientEndPoint, kCGGradientDrawsBeforeStartLocation);


- (void)drawString:(NSString *)string atPoint:(CGPoint)point withAttributes:(NSDictionary *)attributes {

 [string drawAtPoint:point withAttributes:attributes];

- (void)drawString:(NSString *)string inRect:(CGRect)rect withAttributes:(NSDictionary *)attributes {

 [string drawInRect:rect withAttributes:attributes];

- (void)drawAttributedString:(NSAttributedString *)string atPoint:(CGPoint)point {

 [string drawAtPoint:point];

- (void)drawAttributedString:(NSAttributedString *)string inRect:(CGRect)rect {

 [string drawInRect:rect];

- (void)beginPath {

 if (_context) {

 CGContextBeginPath(_context);

- (void)closePath {

 if (_context) {

 CGContextClosePath(_context);

- (void)strokePath {

 if (_context) {

 CGContextStrokePath(_context);

- (void)fillPath {

 if (_context) {

 CGContextFillPath(_context);

- (void)strokeAndFillPath {

 if (_context) {

 CGContextDrawPath(_context, kCGPathFillStroke);

- (void)drawStrokeBlock:(CGContextObjectDrawBlock_t)block {

 [self beginPath];

 __weak CGContextObject *weakSelf = self;

 block(weakSelf);

 [self closePath];

 [self strokePath];

- (void)drawFillBlock:(CGContextObjectDrawBlock_t)block {

 [self beginPath];

 __weak CGContextObject *weakSelf = self;

 block(weakSelf);

 [self closePath];

 [self fillPath];

- (void)drawStrokeAndFillBlock:(CGContextObjectDrawBlock_t)block {

 [self beginPath];

 __weak CGContextObject *weakSelf = self;

 block(weakSelf);

 [self closePath];

 [self strokeAndFillPath];

- (void)drawStrokeBlock:(CGContextObjectDrawBlock_t)block closePath:(BOOL)closePath {

 [self beginPath];

 __weak CGContextObject *weakSelf = self;

 block(weakSelf);

 if (closePath) {

 [self closePath];

 [self strokePath];

- (void)drawFillBlock:(CGContextObjectDrawBlock_t)block closePath:(BOOL)closePath {

 [self beginPath];

 __weak CGContextObject *weakSelf = self;

 block(weakSelf);

 if (closePath) {

 [self closePath];

 [self fillPath];

- (void)drawStrokeAndFillBlock:(CGContextObjectDrawBlock_t)block closePath:(BOOL)closePath {

 [self beginPath];

 __weak CGContextObject *weakSelf = self;

 block(weakSelf);

 if (closePath) {

 [self closePath];

 [self strokeAndFillPath];

- (void)drawImage:(UIImage *)image atPoint:(CGPoint)point {

 [image drawAtPoint:point];

- (void)drawImage:(UIImage *)image atPoint:(CGPoint)point blendMode:(CGBlendMode)blendMode alpha:(CGFloat)alpha {

 [image drawAtPoint:point blendMode:blendMode alpha:alpha];

- (void)drawImage:(UIImage *)image inRect:(CGRect)rect {

 [image drawInRect:rect];

- (void)drawImage:(UIImage *)image inRect:(CGRect)rect blendMode:(CGBlendMode)blendMode alpha:(CGFloat)alpha {

 [image drawInRect:rect blendMode:blendMode alpha:alpha];

- (void)drawImage:(UIImage *)image asPatternInRect:(CGRect)rect {

 [image drawAsPatternInRect:rect];

- (void)saveStateToStack {

 if (_context) {

 CGContextSaveGState(_context);

- (void)restoreStateFromStack {

 if (_context) {

 CGContextRestoreGState(_context);

#pragma mark - 重写setter,getter方法

@synthesize strokeColor = _strokeColor;

- (void)setStrokeColor:(RGBColor *)strokeColor {

 if (_context) {

 _strokeColor = strokeColor;

 CGContextSetRGBStrokeColor(_context, strokeColor.red, strokeColor.green, strokeColor.blue, strokeColor.alpha);

- (RGBColor *)strokeColor {

 return _strokeColor;

@synthesize fillColor = _fillColor;

- (void)setFillColor:(RGBColor *)fillColor {

 if (_context) {

 _fillColor = fillColor;

 CGContextSetRGBFillColor(_context, fillColor.red, fillColor.green, fillColor.blue, fillColor.alpha);

- (RGBColor *)fillColor {

 return _fillColor;

@synthesize lineWidth = _lineWidth;

- (void)setLineWidth:(CGFloat)lineWidth {

 if (_context) {

 _lineWidth = lineWidth;

 CGContextSetLineWidth(_context, lineWidth);

- (CGFloat)lineWidth {

 return _lineWidth;

@synthesize lineCap = _lineCap;

- (void)setLineCap:(CGLineCap)lineCap {

 if (_context) {

 _lineCap = lineCap;

 CGContextSetLineCap(_context, lineCap);

- (CGLineCap)lineCap {

 return _lineCap;

@end

细节

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