#import "watermarkView.h"#define HORIZONTAL_SPACE 30//水平间距#define VERTICAL_SPACE 50//竖直间距#define CG_TRANSFORM_ROTATION (M_PI_2 / 3)//旋转角度(正旋45度 || 反旋45度)@implementation watermarkView- (instancetype)initWithFrame:(CGRect)frame WithText:(NSString *)markText{ if(self = [super initWithFrame:frame]){ UIFont *font = [UIFont systemFontOfSize:14]; UIColor *color = YTHColorAlpha(152, 152, 152, 0.1); //原始image的宽高 CGFloat viewWidth = frame.size.width; CGFloat viewHeight = frame.size.height; //为了防止图片失真，绘制区域宽高和原始图片宽高一样 UIGraphicsBeginImageContext(CGSizeMake(viewWidth, viewHeight)); //sqrtLength：原始image的对角线length。在水印旋转矩阵中只要矩阵的宽高是原始image的对角线长度，无论旋转多少度都不会有空白。 CGFloat sqrtLength = sqrt(viewWidth*viewWidth + viewHeight*viewHeight); //文字的属性 NSDictionary *attr = @{ //设置字体大小 NSFontAttributeName: font, //设置文字颜色 NSForegroundColorAttributeName :color, }; NSString* mark = markText; NSMutableAttributedString *attrStr = [[NSMutableAttributedString alloc] initWithString:mark attributes:attr]; //绘制文字的宽高 CGFloat strWidth = attrStr.size.width; CGFloat strHeight = attrStr.size.height; //开始旋转上下文矩阵，绘制水印文字 CGContextRef context = UIGraphicsGetCurrentContext(); //将绘制原点（0，0）调整到原image的中心 CGContextConcatCTM(context, CGAffineTransformMakeTranslation(viewWidth/2, viewHeight/2)); //以绘制原点为中心旋转 CGContextConcatCTM(context, CGAffineTransformMakeRotation(CG_TRANSFORM_ROTATION)); //将绘制原点恢复初始值，保证当前context中心和源image的中心处在一个点(当前context已经旋转，所以绘制出的任何layer都是倾斜的) CGContextConcatCTM(context, CGAffineTransformMakeTranslation(-viewWidth/2, -viewHeight/2)); //计算需要绘制的列数和行数 int horCount = sqrtLength / (strWidth + HORIZONTAL_SPACE) + 1; int verCount = sqrtLength / (strHeight + VERTICAL_SPACE) + 1; //此处计算出需要绘制水印文字的起始点，由于水印区域要大于图片区域所以起点在原有基础上移 CGFloat orignX = -(sqrtLength-viewWidth)/2; CGFloat orignY = -(sqrtLength-viewHeight)/2; //在每列绘制时X坐标叠加 CGFloat tempOrignX = orignX; //在每行绘制时Y坐标叠加 CGFloat tempOrignY = orignY; for (int i = 0; i < horCount * verCount; i++) { [mark drawInRect:CGRectMake(tempOrignX, tempOrignY, strWidth, strHeight) withAttributes:attr]; if (i % horCount == 0 && i != 0) { tempOrignX = orignX; tempOrignY += (strHeight + VERTICAL_SPACE); }else{ tempOrignX += (strWidth + HORIZONTAL_SPACE); } } //根据上下文制作成图片 UIImage *finalImg = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); CGContextRestoreGState(context); self.image = finalImg; } return self;}-(UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event{ //1.判断自己能否接收事件 if(self.userInteractionEnabled == NO || self.hidden == YES || self.alpha <= 0.01) { return nil; } //2.判断当前点在不在当前View. if (![self pointInside:point withEvent:event]) { return nil; } //3.从后往前遍历自己的子控件.让子控件重复前两步操作,(把事件传递给,让子控件调用hitTest) int count = (int)self.subviews.count; for (int i = count - 1; i >= 0; i--) { //取出每一个子控件 UIView *chileV = self.subviews[I]; //把当前的点转换成子控件坐标系上的点. CGPoint childP = [self convertPoint:point toView:chileV]; UIView *fitView = [chileV hitTest:childP withEvent:event]; //判断有没有找到最适合的View if(fitView){ return fitView; } } //4.没有找到比它自己更适合的View.那么它自己就是最适合的View return self;}//作用:判断当前点在不在它调用View,(谁调用pointInside,这个View就是谁)//什么时候调用:它是在hitTest方法当中调用的.//注意:point点必须得要跟它方法调用者在同一个坐标系里面-(BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event{ NSLog(@"%s",__func__); return NO;} //加水印 watermarkView *watermark = [[watermarkView alloc] initWithFrame:CGRectMake(0, 0, KScreenW, KScreenH) WithText:@"测试"]; [self.view addSubview:watermark];
