makeObjectsPerformSelector

makeObjectsPerformSelector.m

#import <UIKit/UIKit.h>

int main(int argc, char *argv[])
{
    @autoreleasepool {
        UIView* superView = [[UIView alloc] initWithFrame:CGRectZero];
        
        for(int i = 0; i < 10; i++){
            UIView* view = [[UIView alloc] initWithFrame:CGRectZero];
            [superView addSubview:view];
        }
        
        NSLog(@"count = %d", [superView.subviews count]);
        [superView.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];
        NSLog(@"count = %d", [superView.subviews count]);
    }
}

2011-09-16 09:44:47.526 Hoge100[1529:40b] count = 10
2011-09-16 09:44:47.527 Hoge100[1529:40b] count = 0


makeObjectsPerformSelector:
Sends to each object in the array the message identified by a given selector, 
starting with the first object and continuing through the array to the last object.

- (void)makeObjectsPerformSelector:(SEL)aSelector
Parameters
aSelector
A selector that identifies the message to send to the objects in the array. 
The method must not take any arguments, 
and must not have the side effect of modifying the receiving array.
Discussion
This method raises an NSInvalidArgumentException if aSelector is NULL.

Availability
Available in iOS 2.0 and later.
See Also
– makeObjectsPerformSelector:withObject:
Related Sample Code
LazyTableImages
Declared In
NSArray.h


@interface NSArray (NSExtendedArray)
- (void)makeObjectsPerformSelector:(SEL)aSelector;
- (void)makeObjectsPerformSelector:(SEL)aSelector withObject:(id)argument;


@interface NSSet (NSExtendedSet)
- (void)makeObjectsPerformSelector:(SEL)aSelector;
- (void)makeObjectsPerformSelector:(SEL)aSelector withObject:(id)argument;

それらを使うと、Rubyのmapっぽい感じになりますね。