ios学习第六天（四）美丽的自定义View

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先看效果，如果使用线程控制，树的颜色将会变化，使用的图片如果足够精致，效果将会更好。

图片中这棵树，不是背景图片，是自定义View+图片共同效果，借助上一篇的彩色效果，加上一颗树的图片即可完成，看代码吧，太晚了，不解释。

////  MyMagicalView.h//  MyUIView////  Created by Moluth on 17/4/12.//  Copyright (c) 2017年 Moluth. All rights reserved.//#import <UIKit/UIKit.h>@interface MyMagicalView : UIView{@public double tr,tg,tb;@public void* imageData;@public int width,height;}@end

////  MyMagicalView.m//  MyUIView////  Created by Moluth on 17/4/12.//  Copyright (c) 2017年 Moluth. All rights reserved.//#import "MyMagicalView.h"@implementation MyMagicalView- (id)initWithFrame : (CGRect)frame{    self = [super initWithFrame:frame];    UIImage *img=[UIImage imageNamed:@"tree.jpg"];    [self getImageData:img];    return self;}-(void)drawRect:(CGRect)rect{        // 获取图形绘制上下文                int xa=round(rect.origin.x);    int xb=round(rect.origin.x+rect.size.width);    int ya=round(rect.origin.y);    int yb=round(rect.origin.y+rect.size.height);        unsigned char* data=(unsigned char*)imageData;    CGContextRef context = UIGraphicsGetCurrentContext();    double r,g,b;    for(int x=xa;x<xb;x++){        for(int y=ya;y<yb;y++){            int c=data[((height-y)*width+x)*4+1];            if(c>235)continue;                        r=(sin(x*0.0017-y*0.0005+tr+34.1)+1.0)/2.0;            g=(sin((xb-x)*0.0009+y*0.0015+tg)+1.0)/2.0;            b=(sin(x*0.0047+(yb-y)*0.0001+tb)+1.0)/2.0;            CGContextSetRGBFillColor (context,  r, g, b, 1.0);//设置填充颜色            CGContextFillRect(context,CGRectMake(x, y, 1, 1));                    }    }    }- (void)getImageData:(UIImage*)image{    width=image.size.width;    height=image.size.height;    if (imageData == NULL)        imageData = malloc(4 * image.size.width * image.size.height);        CGColorSpaceRef cref = CGColorSpaceCreateDeviceRGB();    CGContextRef gc = CGBitmapContextCreate(imageData,                                            image.size.width,image.size.height,                                            8,image.size.width*4,                                            cref,kCGImageAlphaPremultipliedFirst);    CGColorSpaceRelease(cref);    UIGraphicsPushContext(gc);        [image drawAtPoint:CGPointMake(0.0f, 0.0f)];        UIGraphicsPopContext();    CGContextRelease(gc);}@end

///今天到此为止了，结束，bye

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