UITextView iOS 7的行數

Question

在iOS 6中，我使用此代碼獲取UITextView的行數：

int numLines = textView.contentSize.height / textView.font.lineHeight;

但這在iOS 7中不起作用。如何獲得iOS 7中UITextView的總行數？

Answer 1

你可以使用這樣的東西。 這是低性能，但這是我現在可以想到的。

NSString *string=textView3.text;
NSArray *array=[string componentsSeparatedByString:@"\n"];
NSLog(@"%d",array.count);

Answer 2

您可以使用UITextView的UITextInputTokenizer / UITextInput協議方法執行此操作。

id<UITextInputTokenizer> tokenizer = textView.tokenizer;
UITextPosition *pos = textView.endOfDocument; int lines = 0;

while (true){
    UITextPosition *lineEnd = [tokenizer positionFromPosition:pos toBoundary:UITextGranularityLine inDirection:UITextStorageDirectionBackward];

    if([textView comparePosition:pos toPosition:lineEnd] == NSOrderedSame){
        pos = [tokenizer positionFromPosition:lineEnd toBoundary:UITextGranularityCharacter inDirection:UITextStorageDirectionBackward];

        if([textView comparePosition:pos toPosition:lineEnd] == NSOrderedSame) break;

        continue;
    }

    lines++; pos = lineEnd;
}

//lines--; // Compensation for extra line calculated (??)

（ GIST ）

Answer 3

您可以將String和textView傳遞給此方法，即使用戶按下新行，它也會返回此textview中的當前數字行：

-(int)numberOfRows:(NSString *)string inView:(UITextView*)txtView
{

CGSize maximumLabelSize = CGSizeMake(MAXFLOAT , MAXFLOAT);

NSStringDrawingOptions options = NSStringDrawingTruncatesLastVisibleLine |
NSStringDrawingUsesLineFragmentOrigin;

NSString *new = [string stringByReplacingOccurrencesOfString: @"\n" withString:@" "];
NSDictionary *attr = @{NSFontAttributeName: [UIFont fontWithName:urFont size:urSize]};
CGRect bounds = [new boundingRectWithSize:maximumLabelSize
                                          options:options
                                       attributes:attr
                                          context:nil];

CGSize viewSize = bounds.size;


int row = floor(txtView.contentSize.height / viewSize.height ) ;


return row;
}