iOS的runtime获取类的属性的数据类型

iOS的runtime获取类的属性的数据类型

#import "NSString+Property.h"#import <objc/runtime.h>#include <string.h>@implementation NSString (Property)/** * Get the data type of a property in a class * @designatedClass, designated class name of `Class` */- (NSString *)getPropertyTypeWithClass:(Class)designatedClass {    const char * propertyName = self.UTF8String;    NSString *property_data_type = nil;    unsigned int outCount = 0, i = 0;    objc_property_t *properties = class_copyPropertyList(designatedClass, &outCount);    for (; i < outCount; i++) {        objc_property_t property = properties[i];        const char *property_name = property_getName(property);        if (strcmp(property_name, propertyName) == 0) {            const char * property_attr = property_getAttributes(property);            //If the property is a type of Objective-C class, then substring the variable of `property_attr` in order to getting its real type            if (property_attr[1] == '@') {                char * occurs1 =  strchr(property_attr, '@');                char * occurs2 =  strrchr(occurs1, '"');                char dest_str[40]= {0};                strncpy(dest_str, occurs1, occurs2 - occurs1);                char * realType = (char *)malloc(sizeof(char) * 50);                int i = 0, j = 0, len = (int)strlen(dest_str);                for (; i < len; i++) {                    if ((dest_str[i] >= 'a' && dest_str[i] <= 'z') || (dest_str[i] >= 'A' && dest_str[i] <= 'Z')) {                        realType[j++] = dest_str[i];                    }                }                property_data_type = [NSString stringWithFormat:@"%s", realType];                free(realType);            } else {                //Otherwise, take the second subscript character for comparing to the @encode()                char * realType = [self getPropertyRealType:property_attr];                property_data_type = [NSString stringWithFormat:@"%s", realType];            }        }    }    return property_data_type;}/** * Get the data type of a property in a class that the encode characters is deponding on the following Link * https://developer.apple.com/library/content/documentation/Cocoa/Conceptual/ObjCRuntimeGuide/Articles/ocrtTypeEncodings.html#//apple_ref/doc/uid/TP40008048-CH100-SW1 **/- (char *)getPropertyRealType:(const char *)property_attr {    char * type;    char t = property_attr[1];    if (strcmp(&t, @encode(char)) == 0) {        type = "char";    } else if (strcmp(&t, @encode(int)) == 0) {        type = "int";    } else if (strcmp(&t, @encode(short)) == 0) {        type = "short";    } else if (strcmp(&t, @encode(long)) == 0) {        type = "long";    } else if (strcmp(&t, @encode(long long)) == 0) {        type = "long long";    } else if (strcmp(&t, @encode(unsigned char)) == 0) {        type = "unsigned char";    } else if (strcmp(&t, @encode(unsigned int)) == 0) {        type = "unsigned int";    } else if (strcmp(&t, @encode(unsigned short)) == 0) {        type = "unsigned short";    } else if (strcmp(&t, @encode(unsigned long)) == 0) {        type = "unsigned long";    } else if (strcmp(&t, @encode(unsigned long long)) == 0) {        type = "unsigned long long";    } else if (strcmp(&t, @encode(float)) == 0) {        type = "float";    } else if (strcmp(&t, @encode(double)) == 0) {        type = "double";    } else if (strcmp(&t, @encode(_Bool)) == 0 || strcmp(&t, @encode(bool)) == 0) {        type = "BOOL";    } else if (strcmp(&t, @encode(void)) == 0) {        type = "void";    } else if (strcmp(&t, @encode(char *)) == 0) {        type = "char *";    } else if (strcmp(&t, @encode(id)) == 0) {        type = "id";    } else if (strcmp(&t, @encode(Class)) == 0) {        type = "Class";    } else if (strcmp(&t, @encode(SEL)) == 0) {        type = "SEL";    } else {        type = "";    }    return type;}@end