iphone中得到字符串所占空间的大小

NSString *string1 = @"Hi to all!I've this question for you, and i hope you can help me"; CGRect textSize = CGRectMake(0.0, 0.0, 320.0, FLT_MAX); UIFont *font = [UIFont fontWithName:@"Helvetica-Bold" size:20.0]; UILabel *label = [[UILabel alloc] init]; label.lineBreakMode = UILineBreakModeWordWrap; // Zero means infinite in this case label.numberOfLines = 0; label.font = font; label.text = string1; label.frame = [label textRectForBounds:textSize limitedToNumberOfLines:0]; NSLog(@"Frame at width %f height %f", label.frame.size.width, label.frame.size.height);