IQKeyboard 改变键盘样式

添加属性

@property (nonatomic, strong) IQKeyboardReturnKeyHandler    *returnKeyHandler;

- (void)viewDidLoad {

    [super viewDidLoad];

//修改样式

  self.returnKeyHandler = [[IQKeyboardReturnKeyHandler alloc] initWithViewController:self];    self.returnKeyHandler.lastTextFieldReturnKeyType = UIReturnKeySearch;

}