UILabel *label1 = [[UILabel alloc]init];
    label1.frame = CGRectMake(20, 20, 200, 200);
    label1.backgroundColor = [UIColor yellowColor];
    //文本
    label1.text = @"hello,hello,hello,hello,hello,hello,hello,hello,hello,";
    //文字颜色
    label1.textColor = [UIColor blackColor];
    //文字布局模式
    label1.textAlignment = NSTextAlignmentLeft;
    label1.alpha = 0.5f;
    //设置字体
    label1.font = [UIFont systemFontOfSize:30];
    label1.font = [UIFont boldSystemFontOfSize:30];
    label1.font = [UIFont italicSystemFontOfSize:30];
    label1.font = [UIFont fontWithName:@"Didot" size:30];   //设置字体和字号
    //设置阴影
    label1.shadowColor = [UIColor grayColor];
    label1.shadowOffset = CGSizeMake(1, 2);
    
    //换行 labe要有足够空间
    label1.lineBreakMode = NSLineBreakByWordWrapping; //换行模式
    label1.numberOfLines = 10;
    
    CGSize size = [label1.text sizeWithFont:label1.font constrainedToSize:CGSizeMake(200, 10000) lineBreakMode:NSLineBreakByWordWrapping];
    label1.frame = CGRectMake(label1.frame.origin.x
                              , label1.frame.origin.y
                              , label1.frame.size.width, size.height);
    
    [self.view addSubview:label1];

文本

    label1.text =@"hello,hello,hello,hello,hello,hello,hello,hello,hello,";

文字颜色

    label1.textColor = [UIColorblackColor];

文字布局模式

    label1.textAlignment =NSTextAlignmentLeft;

    label1.alpha =0.5f;

设置字体

    label1.font = [UIFontsystemFontOfSize:30];

    label1.font = [UIFontboldSystemFontOfSize:30];

    label1.font = [UIFont thinSystemFontOfSize:30];

    label1.font = [UIFontitalicSystemFontOfSize:30];

设置字体和字号

    label1.font = [UIFontfontWithName:@"Didot"size:30];  

设置阴影

    label1.shadowColor = [UIColorgrayColor];

    label1.shadowOffset =CGSizeMake(1,2);

    

换行 labe要有足够空间

    label1.lineBreakMode =NSLineBreakByWordWrapping;//换行模式

    label1.numberOfLines =10;