NSNumber類型

老寫法：

NSNumber *number;number = [NSNumber numberWithChar:'X'];number = [NSNumber numberWithInt:12345];number = [NSNumber numberWithUnsignedLong:12345ul];number = [NSNumber numberWithLongLong:12345ll];number = [NSNumber numberWithFloat:123.45f];number = [NSNumber numberWithDouble:123.45];number = [NSNumber numberWithBool:YES];

新寫法：

NSNumber *number;number = @'X';number = @12345;number = @12345ul;number = @12345ll;number = @123.45f;number = @123.45;number = @YES;

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NSArray類型

老寫法：

NSArray *array = [NSArray arrayWithObjects:@"object1", @"object2", @"object3", nil];

新寫法：

NSArray *array = @[ @"object1", @"object2", @"object3" ];

NSDictonary類型

老寫法：

NSDictionary *dict = [NSDictionary dictionaryWithObjects:@[@"value1", @"value2", @"value3"]forKeys:@[@"key1", @"key2", @"key3"]];

新寫法：

NSDictionary *dict = @{@"key1": @"value1",@"key2": @"value2",@"key3": @"value3" };

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快速通過下標定位對象

NSArray *array =@[ @"object1", @"object2", @"object3" ];id obj = array[0]; //通過下標方式獲取數組對象，替換原有寫法：array objectAtIndex:i];NSString *obj1 = @"oooo";array[0] = obj1; //也可以直接為數組對象賦值。替換原有寫法：[array replaceObjectAtIndex:i withObject:newObj]; NSDictionary *dict = @{@"key1": @"value1",@"key2": @"value2",@"key3": @"value3" };id obj2 = dict[@"key1"];//獲取o2對象，替換原有寫法：[dic objectForKey:k2];dict[@"key2"] = obj; //重新為鍵為k2的對象賦值，替換原有寫法：[dic setObject:newObj forKey:k2]

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祝您開心愉快 ^_^

轉載于:https://www.cnblogs.com/tianglin/p/3567414.html

《新程序員》：云原生和全面數字化實踐50位技術專家共同創作，文字、視頻、音頻交互閱讀

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