sort全般むずい。

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sort全般むずい。

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所有子元素执行某方法
这是一个平时很少用到的方法makeObjectsPerformSelector, 让array或者set里的所有子元素执行一个方法,估计也是遍历然后挨个执行,但是也可能SDK做了优化.
[[self subviews] makeObjectsPerformSelector: @selector(removeFromSuperview)];
上面这条语句的执行结果就是self里的所有子视图被移除.
Finding objects in an NSSet using objectsPassingTest
- (myObject *)findObjectWithDescription:(NSString*)d in:(NSSet*)set
{
[set objectsPassingTest:^(id obj, BOOL *stop)
{
if([d isEqualToString:((myObject*)obj).description)
{
*stop = YES;
return YES;
}
else
{
return NO;
}
}];
}