UILabel 動態計算高度

UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0,0,0,0)];    //設定自動行數與字元換行，為0標示無限制    [label setNumberOfLines:0];    label.lineBreakMode = NSLineBreakByWordWrapping;//換行方式    NSString *strTest = @"用中問和英文 混合測試! just test, good luck!! 看看行不行";       UIFont *font = [UIFont fontWithName:@"Arial" size:12];    label.font = font;        CGSize size = CGSizeMake(LableWight,CGFLOAT_MAX);//LableWight標籤寬度，固定的

//計算實際frame大小，並將label的frame變成實際大小

 CGSize labelsize = [strTest sizeWithFont:font constrainedToSize:size lineBreakMode:label.lineBreakMode]; 
label.frame = CGRectMake(0,0, labelsize.width, labelsize.height); label.text = strTest; [self.view addSubview:label];