cocoa简洁写法笔记

对cocoa的一些语法糖做的笔记

NSNumber

NSNumber *totalNumber = [NSNumber numberWithInt:1];
to
NSNumber *totalNumber = @1;

## 更多拓展
NSNumber *floatNumber = @2.5f;
NSNumber *boolNumber = @YES;
NSNumber *totalNumber = @(5 * 6.5f);

NSArray

NSArray *members = [NSArray arrayWithObjects:@"father",@"mother",@"Jim",nil];
to
NSArray *members = @[@"father",@"mother",@"Jim"];

# 取值
NSString *username = [members objectAtIndex:2];
to
NSString *username = members[2];

NSDictionary

NSDictionary *personData = [NSDictionary dictionaryWithObjectsAndKeys:@"Jim",@"name",@"man",@"gender",nil];
to
NSDictionary *personData = @{@"name":@"Jim",
							 @"gender":@"man"};

# 取值
NSString *username = [personData objectForKey:@"name"];
to
NSString *username = person[@"name"];

# 设值和替换
[personData replaceObjectAtIndex:1 withOjbect:@"woman"];
[personData setObject:@"address" forKey:@"Beijing"];
to
person[1] = @"woman";
person[@"address"] = @"Beijing";