[Foundation] 简写代码 string literal

[NSNumber numberWithInt:1];
@1;

[NSNumber numberWithFloat:0.1f];
@0.1f;

[NSNumber numberWithBool:YES];
@YES;

<span style="font-size:14px;font-weight: normal;">     [NSString stringWithString:@"Hello"]
@"Hello"</span>

<span style="font-size:14px;font-weight: normal;">     [NSArray arrayWithObjects:@"test", nil];
@[@"test"];</span>

<span style="font-size:14px;font-weight: normal;">NSMutableArray* array = [NSMutableArray arrayWithObjects:@"test", nil];
NSMutableArray* array2 = [@[@"test"] mutableCopy];</span>

<span style="font-size:14px;font-weight: normal;">     [NSDictionary dictionaryWithObject:@"value" forKey:@"key"];
@{@"key":@"value"};</span>

NSMutableDictionary* dic = [NSMutableDictionary dictionaryWithObject:@"value" forKey:@"key"];
NSMutableDictionary* dic2 = [@{@"key":@"value"}mutableCopy];