截屏
- (UIImage *)screenshot:(UIView *)view
{
CGFloat scale = [[UIScreen mainScreen] scale];
UIImage *screenshot;
UIGraphicsBeginImageContextWithOptions(view.frame.size, NO, scale);
{
if(UIGraphicsGetCurrentContext() == nil)
{
NSLog(@"UIGraphicsGetCurrentContext is nil. You may have a view (%@) with no really frame (%@)", [view class], NSStringFromCGRect(view.frame));
}
else
{
[view.layer renderInContext:UIGraphicsGetCurrentContext()];
screenshot = UIGraphicsGetImageFromCurrentImageContext();
}
}
UIGraphicsEndImageContext();
return screenshot;
}
在图片上绘制文字
//在图片上绘制文字
+(UIImage *)DrawText:(NSString *)text forImage:(UIImage *)image{
CGSize size = CGSizeMake(image.size.width,image.size.height ); // 画布大小
UIGraphicsBeginImageContextWithOptions(size,NO,0.0);
[image drawAtPoint:CGPointMake(0,0)];
// 获得一个位图图形上下文
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextDrawPath(context,kCGPathStroke);
NSDictionary *attributes = @{ NSFontAttributeName:[UIFont systemFontOfSize:30.f], NSForegroundColorAttributeName:[UIColor redColor]};
//计算出文字的宽度 设置控件限制的最大size为图片的size
CGSize textSize = [text boundingRectWithSize:size options:NSStringDrawingUsesLineFragmentOrigin attributes:attributes context:nil].size;
// 画文字 让文字处于居中模式
[text drawAtPoint:CGPointMake((size.width - textSize.width)/2,image.size.height - 40) withAttributes:attributes];
// 返回绘制的新图形
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
