UITextField 和 UITextView

如图修改键盘

UIReturnKeyDefault

UIReturnKeyDefault.jpg

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UIReturnKeyGo

UIReturnKeyGo.jpg

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UIReturnKeyGoogle

UIReturnKeyGoogle.jpg

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UIReturnKeyJoin

UIReturnKeyJoin.jpg

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UIReturnKeyNext

UIReturnKeyNext.jpg

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UIReturnKeyRoute

UIReturnKeyRoute.jpg

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UIReturnKeySearch

UIReturnKeySearch.jpg

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UIReturnKeySend

UIReturnKeySend.jpg

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UIReturnKeyYahoo

UIReturnKeyYahoo.jpg

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UIReturnKeyDone

UIReturnKeyDone.jpg

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UIReturnKeyEmergencyCall

UIReturnKeyEmergencyCall.jpg

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UIReturnKeyContinue

UIReturnKeyContinue.jpg

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UITextView *textView = [[UITextView alloc] init];
textView.returnKeyType = UIReturnKeyDone;

UITextField *textField= [[UITextField alloc] init];
textView.returnKeyType = UIReturnKeyDone;

对回车符事件进行监听

实现 UITextViewDelegate代理里面响

• -(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text

实现 UITextFieldDelegate代理里面响

• -(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string

这个函数的最后一个参数text代表你每次输入的的那个字，所以：
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
    if ([text isEqualToString:@"\n"]){ //判断输入的字是否是回车，即按下return
        //[textView endEditing:YES];
        //在这里做你响应return键的代码

        return NO; //这里返回NO，就代表return键值失效，即页面上按下return，不会出现换行，如果为yes，则输入页面会换行
    }

    return YES;
}

typedef NS_ENUM(NSInteger, UIReturnKeyType) {
    UIReturnKeyDefault,
    UIReturnKeyGo,
    UIReturnKeyGoogle,
    UIReturnKeyJoin,
    UIReturnKeyNext,
    UIReturnKeyRoute,
    UIReturnKeySearch,
    UIReturnKeySend,
    UIReturnKeyYahoo,
    UIReturnKeyDone,
    UIReturnKeyEmergencyCall,
    UIReturnKeyContinue NS_ENUM_AVAILABLE_IOS(9_0),
};