iOS:如何以编程方式循环遍历类对象的对象/属性(非UI元素)

Question

我正在尝试NSLog,viewController的对象/属性.

我已经开始循环子视图,超级视图(基本上是UIElements),如下面的代码

@interface ViewController : UIViewController 

{
NSString *string;
NSMutableArray *mutableArray ;
NSMutableDictionary *mutableDictionary;    
}
@property NSString *string;
@property NSMutableArray *mutableArray ;
@property NSMutableDictionary *mutableDictionary; 


@implementation ViewController

-(void) loopThrough{
  for (id obj in [self.view subviews]) {
    nslog(@"This would print subviews properties%@", obj)
}

}

我的问题与上面类似,可以循环遍历非UI元素集NSString,NSArray等,

Implementation Scenario
我在viewController中有4个网络调用超时计时器,当一个网络调用成功时,必须禁用超时计时器.但由于发生了四次网络调用,我不想声明viewController的4个定时器全局变量,并分别使每个定时器无效.相反,我想循环并使计时器无效.

Answer 1

您需要使用Objective C运行时库

#import <objc/runtime.h>

- (NSSet *)propertyNames {
   NSMutableSet *propNames = [NSMutableSet set];
   unsigned int outCount, i;
   objc_property_t *properties = class_copyPropertyList([self class], &outCount);
   for (i = 0; i < outCount; i++) {
       objc_property_t property = properties[i];
       NSString *propertyName = [NSString stringWithCString:property_getName(property) encoding:NSUTF8StringEncoding];
       [propNames addObject:propertyName];
   }
   free(properties);
   return propNames;
}

- (void)loopThrough {
  for(NSString *key in [self propertyNames]) {
       NSLog (@"value = %@ , property %@",[self valueForKey:key],key);
  }
}