unsigned int outCount = 0;//获得Class c所有属性这里的c是[Model class]objc_property_t *properties = class_copyPropertyList(c, &outCount);for (int i = 0; i < outCount; i++) {objc_property_t propert = properties[i];//获得属性名NSString *key = @(property_getName(propert));//获得属性类型，如CGFloat、nonatomic、copy等信息NSString *type = @(property_getAttributes(propert));NSLog(@"key = %@ , type = %@", key, type);}

　Model模型如下

//属性}
typedef void(^block)();
@interface Model : NSObject
@property (nonatomic, copy) NSString *q_NSString;
@property (nonatomic, assign) CGFloat q_CGFloat;
@property (nonatomic, assign) CGRect q_CGRect;
@property (nonatomic, assign) double q_double;
@property (nonatomic, assign) int q_int;
@property (nonatomic, assign) BOOL q_bool;
@property (nonatomic, assign) float q_float;
@property (nonatomic, assign) short q_short;
@property (nonatomic, assign) long q_long;
@property (nonatomic, assign) long long q_longlong;
@property (nonatomic, assign) Point q_point;@property (nonatomic, strong) id q_id;
@property (nonatomic, weak) id<NSObject> q_delegate;
@property (nonatomic, copy) block q_block;
@property (nonatomic, strong) Model1 *q_model1;@property SEL q_SEL;
@property Class q_Class;
@property Ivar q_Ivar;
@property Method q_Method;

输出结果为

key = q_NSString , type = T@"NSString",C,N,V_q_NSString
key = q_CGFloat , type = Td,N,V_q_CGFloat
key = q_CGRect , type = T{CGRect={CGPoint=dd}{CGSize=dd}},N,V_q_CGRect
key = q_double , type = Td,N,V_q_double
key = q_int , type = Ti,N,V_q_int
key = q_bool , type = TB,N,V_q_bool
key = q_float , type = Tf,N,V_q_float
key = q_short , type = Ts,N,V_q_short
key = q_long , type = Tq,N,V_q_long
key = q_longlong , type = Tq,N,V_q_longlong
key = q_point , type = T{Point=ss},N,V_q_point
key = q_id , type = T@,&,N,V_q_id
key = q_delegate , type = T@"<NSObject>",W,N,V_q_delegate
key = q_block , type = T@?,C,N,V_q_block
key = q_model1 , type = T@"Model1",&,N,V_q_model1
key = q_SEL , type = T:,V_q_SEL
key = q_Class , type = T#,&,V_q_Class
key = q_Ivar , type = T^{objc_ivar=},V_q_Ivar
key = q_Method , type = T^{objc_method=},V_q_Method

NSString *const MJPropertyTypeInt = @"i";
NSString *const MJPropertyTypeShort = @"s";
NSString *const MJPropertyTypeFloat = @"f";
NSString *const MJPropertyTypeDouble = @"d";
NSString *const MJPropertyTypeLong = @"l";
NSString *const MJPropertyTypeLongLong = @"q";
NSString *const MJPropertyTypeChar = @"c";
NSString *const MJPropertyTypeBOOL1 = @"c";
NSString *const MJPropertyTypeBOOL2 = @"b";
NSString *const MJPropertyTypePointer = @"*";NSString *const MJPropertyTypeIvar = @"^{objc_ivar=}";
NSString *const MJPropertyTypeMethod = @"^{objc_method=}";
NSString *const MJPropertyTypeBlock = @"@?";
NSString *const MJPropertyTypeClass = @"#";
NSString *const MJPropertyTypeSEL = @":";
NSString *const MJPropertyTypeId = @"@";

  if ([value isKindOfClass:[NSStringclass]]) {if (propertyClass == [NSURL class]) {// NSString -> NSURL// 字符串转码value = [value mj_url];} else if (type.isNumberType) {NSString *oldValue = value;// NSString -> NSNumbervalue = [numberFormatter_ numberFromString:oldValue];// 如果是BOOLif (type.isBoolType) {// 字符串转BOOL（字符串没有charValue方法）// 系统会调用字符串的charValue转为BOOL类型NSString *lower = [oldValue lowercaseString];if ([lower isEqualToString:@"yes"] || [lower isEqualToString:@"true"]) {value = @YES;} else if ([lower isEqualToString:@"no"] || [lower isEqualToString:@"false"]) {value = @NO;}}}}

- (id)initWithCoder:(NSCoder *)decoder
- (void)encodeWithCoder:(NSCoder *)encoder

+ (NSDictionary *)dictionaryWithJsonString:(NSString *)jsonString {if (jsonString == nil) {
　　　　return nil;}NSData *jsonData = [jsonString dataUsingEncoding:NSUTF8StringEncoding];NSError *error;NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:jsonData        options:NSJSONReadingMutableContainerserror:&error];if(error) {NSLog(@"json解析失败：%@",error);return nil;}return dic;
}

+ (NSString*)dictionaryToJson:(NSDictionary *)dic
{NSError *error = nil;NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dic 　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　options:NSJSONWritingPrettyPrinted 　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　error:&error];return [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
}