NSArray 介绍

NSArray *array = [NSArray arrayWithObjects:@"1",@"2",@"3",nil];

[array enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {

NSLog(@"%zi->%@",idx, obj);

}];

NSMutableString *string1 = [NSMutableString stringWithString:@"A"];

NSMutableString *string2 = [NSMutableString stringWithString:@"B"];

NSMutableString *string3 = [NSMutableString stringWithString:@"C"];

NSArray *listOfObjects = [NSArray arrayWithObjects:string1, string2,string3, nil];

for(NSMutableString *s in listOfObjects){

NSLog(@"This string in lowercase is %@", [s lowercaseString]);

}

[listOfObjects makeObjectsPerformSelector:@selector(appendString:)withObject:@"-MORE"];