iphone - self.variable和self-> variable有什么区别？

Question

我已经看到使用->或在iphone sdk中访问变量。 symbol.Self.variable和self-> variable有什么区别？

Answer 1

点符号通过访问器，箭头符号直接到实例变量。试试这个代码:

@interface Foo : NSObject
@property(assign, nonatomic) NSInteger bar;
@end

@implementation Foo
@synthesize bar;

- (void) setBar: (NSInteger) newBar
{
    NSLog(@"Setting new bar.");
    bar = newBar;
}

- (id) init
{
    self = [super init];
    self->bar = 5; // doesn’t log anything
    self.bar  = 6; // logs
    return self;
}

@end