[ios] (induction) label common methods

1. Center (IOS7 and above)

label.textAlignment = NSTextAlignmentCenter;

 

2. Font size adaptive width

    [label setAdjustsFontSizeToFitWidth:YES];

 

 3. Fonts

//size
label.font = [UIFont systemFontOfSize:15];

// bold
label.font = [UIFont boldSystemFontOfSize:15];