ios改变导航条title的字体大小和颜色

//自定义标题

UILabel *titleLabel = [[UILabel
alloc] initWithFrame:CGRectMake(0,
0 , 100,
44)];
titleLabel.backgroundColor = [UIColor
clearColor];
titleLabel.font = [UIFont
systemFontOfSize:15];
titleLabel.textColor = [UIColor
darkGrayColor];//设置文本颜色

titleLabel.textAlignment =
UITextAlignmentCenter;
titleLabel.text =
@"Settings";

self.navigationItem.titleView = titleLabel;