iOS label的换行符\n

    UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(20, 450, 320 - 20, 45)];spa     [label setTextColor:[UIColorblackColor]];.net     [label setText:@"图片不会被拉伸。\n设置按钮上的图片"];3d     [label setF

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