UILabel 動態計算高度

UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0,0,0,0)];
    //設置自動行數與字符換行，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標簽寬度，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];