Question

我有以下课程。将其命名为“file.h”

@interface ValidationResult : NSObject
@property (nonatomic, assign) BOOL success;
@end

@interface Validator : NSObject
+ (ValidationResult *)validateEmail:(NSString*)inputString isRequiredField:(BOOL)isRequiredField;
@end

在file.m

中

@implementation Validator

+ (ValidationResult *)validateEmail:(NSString*)inputString isRequiredField:(BOOL)isRequiredField{
ValidationResult *validationResult;

if (inputString.length == 0) {
    if(isRequiredField){
        validationResult.success = false;
        return validationResult;
    }else{
        validationResult.success = true;
        return validationResult;
    }
}
@end

我在以下代码中遇到问题

 ValidationResult *validationResult = [[ValidationResult alloc] init];

上面的代码在编译项目时给出了这个错误

Apple Linker Mach-O error. "_OBJC_CLASS_$_ValidationResult", referenced from:

它出了什么问题？我总是使用这样的代码创建新对象，一切都很好。只有这个特殊的课程才能顺利。

任何想法？谢谢！

Answer 1

每个class Uploader extends Controller { function go() { if(isset($_POST['go'])) { /* Create the config for upload library */ /* (pretty self-explanatory) */ $config['upload_path'] = './assets/upload/'; /* NB! create this dir! */ $config['allowed_types'] = 'gif|jpg|png|bmp|jpeg'; $config['max_size'] = '0'; $config['max_width'] = '0'; $config['max_height'] = '0'; /* Load the upload library */ $this->load->library('upload', $config); /* Create the config for image library */ /* (pretty self-explanatory) */ $configThumb = array(); $configThumb['image_library'] = 'gd2'; $configThumb['source_image'] = ''; $configThumb['create_thumb'] = TRUE; $configThumb['maintain_ratio'] = TRUE; /* Set the height and width or thumbs */ /* Do not worry - CI is pretty smart in resizing */ /* It will create the largest thumb that can fit in those dimensions */ /* Thumbs will be saved in same upload dir but with a _thumb suffix */ /* e.g. 'image.jpg' thumb would be called 'image_thumb.jpg' */ $configThumb['width'] = 140; $configThumb['height'] = 210; /* Load the image library */ $this->load->library('image_lib'); /* We have 5 files to upload * If you want more - change the 6 below as needed */ for($i = 1; $i < 6; $i++) { /* Handle the file upload */ $upload = $this->upload->do_upload('image'.$i); /* File failed to upload - continue */ if($upload === FALSE) continue; /* Get the data about the file */ $data = $this->upload->data(); $uploadedFiles[$i] = $data; /* If the file is an image - create a thumbnail */ if($data['is_image'] == 1) { $configThumb['source_image'] = $data['full_path']; $this->image_lib->initialize($configThumb); $this->image_lib->resize(); } } } /* And display the form again */ $this->load->view('upload_form');都应在Interface

中包含以下@implementation

.m file

.m文件

@interface ValidationResult : NSObject
@property (nonatomic, assign) BOOL success;
@end

@interface Validator : NSObject
+ (ValidationResult *)validateEmail:(NSString*)inputString isRequiredField:(BOOL)isRequiredField;
@end

iOS Obj-C分配init问题

1 个答案: