【Foundation-86-2】#import Foundation/NSValue.h

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@interface NSValue (NSValueExtensionMethods)

// 封装 弱引用的类(不知道用那里)0.0

+ (NSValue *)valueWithNonretainedObject:(id)anObject;

@property (nonatomic, readonly) id nonretainedObjectValue;

    // button  是一个 obj（假设是弱引用）__weak UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];button.backgroundColor = [UIColor redColor];[button setFrame:CGRectMake(111, 111, 111, 111)];// value  objNSValue *value = [NSValue valueWithNonretainedObject:button];[array addObject:value];NSValue *newValue = [array objectAtIndex:0];[self.view addSubview:(UIButton *)[newValue nonretainedObjectValue]];

//封装 对象的指针

+ (NSValue *)valueWithPointer:(const void *)pointer;

- (void *)pointerValue;

    NSValue* start = [NSValue valueWithPointer:@selector(start)];[start pointerValue]; //就对应了 @selector(start);UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];[button setFrame:CGRectMake(111, 111, 111, 111)];button.backgroundColor = [UIColor redColor];[self.view addSubview:button];[button addTarget:self action:[start pointerValue] forControlEvents:UIControlEventTouchUpInside];}-(void)start{NSLog(@"11");
}

//判断 2 个value 是否一致

- (BOOL)isEqualToValue:(NSValue *)value;

    NSValue *value1 = [NSValue valueWithCGSize:CGSizeMake(11, 11)];NSValue *value2 = [NSValue valueWithRange:NSMakeRange(11, 11)];if ([value1 isEqualToValue:value2]) {NSLog(@"same");}else{NSLog(@"different");}

@end

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