第三篇简书

1.//隐藏返回按钮的Back文字

[[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -60) forBarMetrics:UIBarMetricsDefault];

2.UISegmentedControl选中时

//定义选中状态的样式selected，类型为字典

NSDictionary *selected =@{NSFontAttributeName:[UIFont systemFontOfSize:20],

NSForegroundColorAttributeName:[UIColor whiteColor]};

//定义未选中状态下的样式normal，类型为字典

NSDictionary *normal =@{NSFontAttributeName:[UIFont systemFontOfSize:20],

NSForegroundColorAttributeName:[UIColor grayColor]};

/*

NSFontAttributeName ->系统宏定义的特殊键，用来给格式字典中的字体赋值

NSForegroundColorAttributeName ->系统宏定义的特殊键，用来给格式字典中的字体颜色赋值

*/

//通过setTitleTextAttributes: forState:方法来给test控件设置文字内容的格式

[segMent setTitleTextAttributes:normal forState:UIControlStateNormal];

[segMent setTitleTextAttributes:selected forState:UIControlStateSelected];