我知道这是个老问题,但我找到了解决您问题的方法。下面是代码示例
1)首先创建一个最小高度的宏
#define MIN_HEIGHT 10.0f
2)之后使用下面的代码根据您指定的文本给出可变高度。但是为此,您需要为 UILabel 或您用于显示文本的任何内容指定框架。
// Initialize UILabel with initial frame.
UILabel *lblMakeModel = [[UILabel alloc] initWithFrame:CGRectMake(5, 0, 180, 50)];
// Set numberOfLines as zero
lblMakeModel.numberOfLines = 0;
// Set text here
lblMakeModel.text = @"sdbsbdjhsbdhjsbdhjasd bhbdhjasbdsahjdbahjsdbjhsd bdhjsabdhjsbdhsbdhsad dhbsadbasdhbsajhdbsadyogi";
// create a constraint for fixed width and maximum 20000 height.
CGSize constraint = CGSizeMake(lblMakeModel.frame.size.width, 20000.0f);
// Get the CGRect with the given constraint for the text of UILabel
CGRect textRect = [lblMakeModel.text boundingRectWithSize:constraint
options:(NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading)
attributes:@{NSFontAttributeName:lblMakeModel.font}
context:nil];
// Set LineBreakMode for UIlabel
[lblMakeModel setLineBreakMode:NSLineBreakByWordWrapping];
[lblMakeModel setAdjustsFontSizeToFitWidth:NO];
// Again set the frame from the height you get from CGRect object.
[lblMakeModel setFrame:CGRectMake(lblMakeModel.frame.origin.x, lblMakeModel.frame.origin.y, lblMakeModel.frame.size.width, MAX(textRect.size.height, MIN_HEIGHT))];