IOS笔记

导航栏高度44，双倍88，给89在ios7下会铺满，86，87会变成黑色

如何获取UITextView中你选中文本的x,y

UITextPosition *beginning = currentTextView.beginningOfDocument;        UITextPosition *start = [currentTextView positionFromPosition:beginning offset:selectedRange.location];        UITextPosition *end = [currentTextView positionFromPosition:start offset:selectedRange.length];        UITextRange *textRange = [currentTextView textRangeFromPosition:start toPosition:end];        CGRect rect = [currentTextView firstRectForRange:textRange];

NSValue 可以将定长的结构体包装成对象指针，如CGRect，CGPoint等。如果是自定义的结构体

可以使用

NSValue *value = [NSValue valueWithBytes:&strut objCType:@encode(strut)];