iOS收起键盘的几种方法

1. [self.textField resignFirstResponder];

2. [self.view endEditing:YES];

3. //适用于 获得当前UIViewController比较困难的时候用
   [[UIApplication sharedApplication] sendAction:@selector(resignFirstResponder) to:nil from:nil forEvent:nil];

4. [[[UIApplication sharedApplication]keyWindow]endEditing:YES];