ios编程:iPhone How-to:给UIView拍照

ios编程:iPhone How-to:给UIView拍照

时间:2011-04-22 csdn博客 林家男孩
 

基本原理就是主要将UIView的layer描绘到图形上下文。UIView全局拍照和局域拍照的代码如下:

1 UIView全局拍照

- (UIImage *) screenImage:(UIView *)view {
UIImage *screenImage;
UIGraphicsBeginImageContext(view.frame.size);
[view.layer renderInContext:UIGraphicsGetCurrentContext()];
screenImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return screenImage;
}

2 UIView局域拍照

- (UIImage *) screenImage:(UIView *)view rect:(CGRect)rect {
CGPoint pt = rect.origin;
UIImage *screenImage;
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextConcatCTM(context,
CGAffineTransformMakeTranslation(-(int)pt.x, -(int)pt.y));
[view.layer renderInContext:context];
screenImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return screenImage;
}

来源:http://blog.csdn.net/lbj05/archive/2011/04/02/6297209.aspx

posted @ 2012-04-26 15:04  松花江以南  阅读(559)  评论(0编辑  收藏  举报