Study on the type of self-active conversion of objective-c KVC

# # # Objective-c KVC Self-active conversion type research

Apple is very kind, KVC time to help us do some type of conversion, the law posted, for the participants to participate in the test

@interface Entity: NSObject

@property (nonatomic, copy) NSString * str;

@property (nonatomic, assign) int i1;
@property (nonatomic, assign) int i2;
@property (nonatomic, assign) int i3;

@property (nonatomic, assign) float f1;

@property (nonatomic, strong) NSNumber * num;

@property (nonatomic, assign) BOOL b1;
@property (nonatomic, assign) BOOL b2;
@property (nonatomic, assign) BOOL b3;

@property (nonatomic, strong) NSDate * date1;

@property (nonatomic, assign) NSTimeInterval t1;

@end

// numeric strings can be converted to numeric types
    [obj setValue: @ "2.4" forKey: @ "i1"];
    // Non-numeric strings are not recognized
    [obj setValue: @ "a" forKey: @ "i2"];
    // Only know the number of special symbols
    [obj setValue: @ "2014 10-24" forKey: @ "i3"];
    
    // This conversion used to be of type NSNumber
    [obj setValue: @ 1 forKey: @ "str"];
    [obj setValue: @ 1.23 forKey: @ "f1"];
    
    // Go to NSString
    [obj setValue: @ "99" forKey: @ "num"];
    
    //> = 1.0 is true, below 1.0 is false
    [obj setValue: @ 0.9 forKey: @ "b1"];
    //> = 1.0 is true, below 1.0 is false
    [obj setValue: @ "1.1" forKey: @ "b2"];
    // true TRUE yes YES false FALSE no NO can recognize
    [obj setValue: @ "TRUE" forKey: @ "b3"];
    
    // turn to NSTring
    [obj setValue: @ "2014-10-24" forKey: @ "date1"];
    // do not know
    [obj setValue: @ "2014-10-24" forKey: @ "t1"];
    
    // in conclusion
    // Numeric string to numeric can be converted to numeric
    // class to class direct assignment without conversion 

Study on the type of self-active conversion of objective-c KVC