Các khai báo cơ bản trong Object c

- Khai báo hằng:

#define SWITCH_TYPE ((int) 2)

#define MY_STRING_CONSTANT @"my_constant"

- Sử dụng NSArray:

Khai báo:

NSArray *arrayOne = @[@"Mercedes-Benz", @"BMW", @"Porsche",

                    @"Opel", @"Volkswagen", @"Audi"];

NSArray *arrayTwo = [NSArray arrayWithObjects:@"Aston Martin",

                    @"Lotus", @"Jaguar", @"Bentley", nil];

NSLog(@"phần tử đầu tiên: %@", arrayOne[0]);

NSLog(@"phần tử đầu tiên: %@", [arrayTwo objectAtIndex:0]);

Kiểm tra phần tử:

if ([arrayOne containsObject:@"BMW"]) {

    NSLog(@"BMW is a German auto maker");

}

- Sử dụng NSMulableArray:

// khai báo

NSMutableArray *arrayOne = [NSMutableArray new];

NSMutableArray *arrayTwo = [NSMutableArray arrayWithObjects: @"Audi A6", @"BMW Z3", @"Audi Quattro", @"Audi TT", nil];

// sử dụng

[arrayOne addObject:@"new obj"];

[arrayOne removeLastObject];

[arrayOne removeAllObjects];

[arrayOne removeObjectAtIndex:0];

// Add BMW F25 to front

[arrayOne insertObject:@"BMW F25" atIndex:0];

    

// Remove BMW F25 from front

[arrayOne removeObjectAtIndex:0];

    

// Remove Audi Quattro

[arrayOne removeObject:@"Audi Quattro"];

// Change second item to Audi Q5

[arrayOne replaceObjectAtIndex:1 withObject:@"Audi Q5"];

...

Customize UITableView

- Tạo CustomCell:
+ Tạo file xib:

+ sửa file ViewController.m:

- (void)viewDidLoad {

    [super viewDidLoad];

    

    _uiTable.dataSource = self;

    _uiTable.delegate = self;

    

    [_uiTable registerNib:[UINib nibWithNibName:@"CustomCell" bundle:nil] forCellReuseIdentifier:@"MyCell"];

}

...

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    

    CustomCell *cell = [tableView dequeueReusableCellWithIdentifier:@"MyCell" forIndexPath:indexPath];

    

    [cell.label setLineBreakMode:NSLineBreakByWordWrapping];

    cell.label.numberOfLines = 0;

    cell.label.text = _dataArray[indexPath.row];

    cell.backgroundColor = [UIColor clearColor];

    return cell;

}

...

- Set background color:

- Căn trái sperator:

- Clear Footer operator:

- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section {

    // This will create a "invisible" footer

    return 0.01f;

}

- (UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section

{

    // To "clear" the footer view

    return [UIView new];

}

- Set height wrap label content:

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    

    CustomCell *cell = [tableView dequeueReusableCellWithIdentifier:@"MyCell" forIndexPath:indexPath];

    

    // label multi line:

    [cell.label setLineBreakMode:NSLineBreakByWordWrapping];

    cell.label.numberOfLines = 0;

    

    cell.label.text = _dataArray[indexPath.row];

    cell.backgroundColor = [UIColor clearColor];

    return cell;

}

// wrap label:

-(CGFloat)tableView:(UITableView *)tableView estimatedHeightForRowAtIndexPath:(NSIndexPath *)indexPath {

    

    return UITableViewAutomaticDimension;

}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {

    

    return UITableViewAutomaticDimension;

}

- Set background selected:

// change background color of selected cell

UIView *bgColorView = [[UIView alloc] init];

[bgColorView setBackgroundColor:[UIColor clearColor]];

[cell setSelectedBackgroundView:bgColorView];

- Khoá select

_contentTableView.allowsSelection = NO;

- Khoá kéo Scroll

_menuTableView.scrollEnabled = NO;

Đặt file .xib làm màn hình chính của ứng dụng

1. tạo project
2. New file như hình

3. Sửa nội dung file AppDelegate.m

#import "AppDelegate.h"

#import "MainViewController.h"

@interface AppDelegate ()

@property (strong, nonatomic) MainViewController *mainViewController;

@property (strong, nonatomic) UINavigationController *navController;

@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    // Override point for customization after application launch.

    

    _window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

    _navController = [[UINavigationController alloc] init];

    _navController.navigationBarHidden = YES;

    _mainViewController = [[MainViewController alloc] init];

    

    _window.rootViewController = [_navController initWithRootViewController:_mainViewController];

    

    return YES;

}

...