java判断富文本中输入长度_iOS富文本给定字体大小计算长度和宽度

- (CGSize)textSizeWithString:(Nsstring *)string Font:(UIFont*)font maxSize:(CGSize)maxSize lineBreakMode:(NSLineBreakMode)lineBreakMode{

CGSize result = CGSizeZero;

do{

if(self.length<=0) {

break;

}

NSMutableParagraphStyle *style = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];

[stylesetLineBreakMode:lineBreakMode];

NSDictionary *attribute = @{NSFontAttributeName: font, NSParagraphStyleAttributeName: style};

CGRect retSize = [string boundingRectWithSize:CGSizeMake(maxSize.width, maxSize.height) options:NSStringDrawingTruncatesLastVisibleLine | NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:attribute context:nil];

result =CGSizeMake(CGRectGetWidth(retSize),CGRectGetHeight(retSize));

}while(0);

returnresult;

}