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- (void)keyboardWillShow:(NSNotification *)aNotification {
UIInterfaceOrientation orientation = ((UIViewController*)delegate).interfaceOrientation;
[UIView beginAnimations:@"viewSlideUp" context:NULL];
UIView *view = [delegate viewForUseWithTool:self];
CGRect frame = [view frame];
switch (orientation) {
case UIInterfaceOrientationLandscapeLeft:
frame.origin.x -= viewSlideDistance;
break;
case UIInterfaceOrientationLandscapeRight:
frame.origin.x += viewSlideDistance;
break;
case UIInterfaceOrientationPortrait:
frame.origin.y -= viewSlideDistance;
break;
case UIInterfaceOrientationPortraitUpsideDown:
frame.origin.y += viewSlideDistance;
break;
default:
break;
}
[view setFrame:frame];
[UIView commitAnimations];
}
- (void)keyboardWillHide:(NSNotification *)aNotification {
UIInterfaceOrientation orientation = ((UIViewController*)delegate).interfaceOrientation;
[UIView beginAnimations:@"viewSlideDown" context:NULL];
UIView *view = [delegate viewForUseWithTool:self];
CGRect frame = [view frame];
switch (orientation) {
case UIInterfaceOrientationLandscapeLeft:
frame.origin.x += viewSlideDistance;
break;
case UIInterfaceOrientationLandscapeRight:
frame.origin.x -= viewSlideDistance;
break;
case UIInterfaceOrientationPortrait:
frame.origin.y += viewSlideDistance;
break;
case UIInterfaceOrientationPortraitUpsideDown:
frame.origin.y -= viewSlideDistance;
break;
default:
break;
}
[view setFrame:frame];
[UIView commitAnimations];
}
当我们编辑完了内容后 我们可以点击屏幕的其他地方（我们设置了［dudelView endEditing:YES］） 或者点击键盘上的落下键盘按钮 这时 进入textView的 delegate
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- (void)textViewDidEndEditing:(UITextView *)textView {
//NSLog(@"textViewDidEndEditing");
TextDrawingInfo *info = [TextDrawingInfo textDrawingInfoWithPath:completedPath text:textView.text strokeColor:delegate.strokeColor font:delegate.font];
[delegate addDrawable:info];
self.completedPath = nil;
UIView *superView = [textView superview];
[[superView viewWithTag:SHADE_TAG] removeFromSuperview];
[textView resignFirstResponder];
[textView removeFromSuperview];
[[NSNotificationCenter defaultCenter] removeObserver:self];
}
这里 用到了一个新类TextDrawingInfo 同上一章 的PathDrawingInfo 类似，都是 存放一个完整操作的 全部信息，由于上一章我们做的是绘图操作，因此PathDrawingInfo 存放的是每次绘图操作的信息， 而这次我们主要向利用coreText在屏幕上显示文字 那么之前绘制的矩形的信息 此时已经没有用 我门要 取得 CoreText 需要的信息，即我们这次文字操作的信息 存到TextDrawingInfo 中去 并且添加到 dudelView 的 drawables中 最后 将没用的东西全部从屏幕上移除
最后看以下 TextDrawingInfo 中的draw方法是怎么把文字绘制上去的
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- (void)draw {
CGContextRef context = UIGraphicsGetCurrentContext();
NSMutableAttributedString *attrString = [[[NSMutableAttributedString alloc] initWithString:se