xcode 4 dot notation code sense problem

问题

if i use dot notation in xcode 4 code completion doesn't work for me (pressing ESC):

NSString *s = @"demo";
NSLog(@"%lu", [s length]); //[s <ESC> code completion works fine
NSLog(@"%lu", s.length); //s.<ESC> code completion doesn't work

??

回答1:

Make sure that the property has a valid @property accessor defined.

// in .h

@property (assign) int length;

// in .m

@synthesize length;

Keep in mind you can have your own accessors and setters, but I think code-sense needs @property to show up the dot notation.

来源：https://stackoverflow.com/questions/6315080/xcode-4-dot-notation-code-sense-problem