UILabel   *label = [[UILabel   alloc]initWithFrame:CGRectMake(10, 100, 300, 150)];   label.text   = @"Hello  world!";   //背景顏色為紅色   label.backgroundColor   = [UIColor   redColor];   //設置字體顏色為白色   label.textColor   = [UIColor   whiteColor];   //文字居中顯示   label.textAlignment   = UITextAlignmentCenter;   //自動折行設置   label.lineBreakMode   = UILineBreakModeWordWrap;   label.numberOfLines   = 0;   //設置字體   label.font =  [UIFont fontWithName:@"Arial-BoldItalicMT" size:32];     //設置陰影的顏色   label.shadowColor  = [UIColor blackColor]