iOS第三方库 --- IQKeyboardManager

1、简介

IQKeyboardManager 是一个自动解决键盘遮挡输入源的库，输入源目前只有 UITextView 和 UITextField；解决方法是让界面内容上移到合适位置让输入框在键盘之上。

2、简单应用

（1）启用IQKeyboardManager

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
  //默认为YES
  [[IQKeyboardManager sharedManager] setEnable:YES];
  [[IQKeyboardManager sharedManager] setEnableAutoToolbar:YES];
    return YES;
}

（2）键盘弹出时，点击背景，键盘收回

[IQKeyboardManager sharedManager].shouldResignOnTouchOutside = YES;

（3）在某个控制器禁用 IQKeyboardManager

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    [[IQKeyboardManager sharedManager] setEnable:NO];
}
- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
    [[IQKeyboardManager sharedManager] setEnable:YES];
}

（4）键盘 Return 键的处理

可以将键盘上 Return 键变为 next 键，点击进入下一个输入框，最后一个UITextField/UITextView 的时候变为 Done ，点击收起键盘。

@interface IQKeyboardManagerController (){
    IQKeyboardReturnKeyHandler * _returnKeyHander;
}

@end

@implementation IQKeyboardManagerController

- (void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
    [IQKeyboardManager sharedManager].enable = YES;
    _returnKeyHander = [[IQKeyboardReturnKeyHandler alloc] initWithViewController:self];
}

- (void)viewWillDisappear:(BOOL)animated{
    [super viewWillDisappear:animated];
    [IQKeyboardManager sharedManager].enable = NO;
}

@end

（5）Done 修改为 完成

[IQKeyboardManager sharedManager].toolbarDoneBarButtonItemText = "完成";
或者
[IQKeyboardManager sharedManager].toolbarDoneBarButtonItemImage = [UIImage imageNamed:@"IQKeyboardImage"];

（6）修改Toolbar颜色

[IQKeyboardManager sharedManager].shouldToolbarUsesTextFieldTintColor = NO;
[IQKeyboardManager sharedManager].toolbarTintColor = [UIColor redColor];

（7）设置键盘textField的距离，不能小于零，默认是10.0。<触发条件是textField需要改变y时 >

[IQKeyboardManager sharedManager].keyboardDistanceFromTextField = 10.0f;

（8）设置 toolBar 上的 placeholder 是否显示

如果输入框有 placeholder 的话，那么在 toolbar 中默认会显示出来。不想要的话就设置为 NO;

@property(nonatomic, assign) BOOL shouldShowTextFieldPlaceholder;

3、源码分析

源码分析：https://www.jianshu.com/p/664efa555f71