Objective-C中block的使用

block.m

int i = 5;
int (^test1)() = ^() {
	return i * i;
};

int (^test2)(int);
test2 = ^(int a) {
	return a * a;
};

NSString* str = ^(NSString* aStr){
	return aStr;
}(@"hello");

NSLog(@"test1===>%d", test1());
NSLog(@"test2===>%d", test2(3));
NSLog(@"str===>%@", str);
NSLog(@"===== END =====");


// ================= 輸出結果 ===================
2012-05-25 16:25:03.544 fs_test[62360:b603] test1===>25
2012-05-25 16:25:03.545 fs_test[62360:b603] test2===>9
2012-05-25 16:25:03.546 fs_test[62360:b603] str===>hello
2012-05-25 16:27:27.395 fs_test[62360:b603] ===== END =====
// =============================================