如下
#import "UIView+WaterMark.h"
@implementation UIView (WaterMark)
-(void)addWaterMarkText:(NSString*)waterText WithTextColor:(UIColor*)color WithFont:(UIFont*)font{
//計算水印文字的寬高
NSString *waterMark = waterText;
CGSize textSize = [waterMark sizeWithAttributes:@{NSFontAttributeName:font}];
CGFloat height = [UIScreen mainScreen].bounds.size.height;
CGFloat width = [UIScreen mainScreen].bounds.size.width;
NSInteger line = height*3.5/80; //多少行
NSInteger row = 20;
for (int i = 0; i < line; i ++) {
for (int j = 0; j < row; j ++) {
CATextLayer *textLayer = [[CATextLayer alloc]init];
textLayer.contentsScale = [UIScreen mainScreen].scale;//按當前螢屏分辨顯示，否則會模糊
CFStringRef fontName = (__bridge CFStringRef)font.fontName;
CGFontRef fontRef =CGFontCreateWithFontName(fontName);
textLayer.font = fontRef;
textLayer.fontSize = font.pointSize;
textLayer.foregroundColor = color.CGColor;
textLayer.string = waterMark;
textLayer.frame = CGRectMake(j*(textSize.width+30), i*60, textSize.width, textSize.height);
//旋轉文字
textLayer.transform = CATransform3DMakeRotation(-M_PI/5, 0,0,3);
[self.layer addSublayer:textLayer];
}
}
}
@end
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標籤：java
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