iOS开发 -李洪强-清除缓存

//

//  SetViewController.m

//  dfhx

//

//  Created by dfhx_iMac_001 on 16/4/5.

//  Copyright © 2016年 luoyun. All rights reserved.

//

#import "SetViewController.h"

@interface SetViewController ()<UITableViewDelegate,UITableViewDataSource>

@property (nonatomic, strong) UITableView * tableView;

@property (nonatomic, strong) NSArray * dataSource;

@property (nonatomic, copy) NSString * cacheSize;

@property (nonatomic, strong) UIView * navView;

@end

@implementation SetViewController

- (void)viewDidLoad {

[super viewDidLoad];

// Do any additional setup after loading the view.

[self tableView];

[self navView];

}

- (UIView *)navView

{

if (!_navView) {

_navView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, Screen_Width, 64)];

_navView.backgroundColor = RGBA(51, 51, 51, 1);

[self.view addSubview:_navView];

UIButton * btn = [UIButton buttonWithType:UIButtonTypeCustom];

[_navView addSubview:btn];

[btn mas_makeConstraints:^(MASConstraintMaker *make) {

make.left.mas_equalTo(_navView).offset(10);

make.size.mas_equalTo(CGSizeMake(40, 40));

make.topMargin.offset(20);

}];

[btn addTarget:self action:@selector(btnAction) forControlEvents:UIControlEventTouchUpInside];

[btn setImage:[UIImage imageNamed:@"backItemImg.png"] forState:UIControlStateNormal];

[btn setImageEdgeInsets:UIEdgeInsetsMake(15, 5, 8, 23)];

}

return _navView;

}

- (void)btnAction

{

AppDelegate * app = (AppDelegate *)[UIApplication sharedApplication].delegate;

[app.window setRootViewController:app.leftSlide];

}

// 设置返回导航栏

- (void)setNavigation

{

UIBarButtonItem *LeftButton = [[UIBarButtonItem  alloc] initWithTitle:nil style:UIBarButtonItemStylePlain target:self action:@selector(back)];

[LeftButton setImage:[UIImage imageNamed:@"backItemImg.png"]];

LeftButton.imageInsets = UIEdgeInsetsMake(20, 0, 15, 20);

LeftButton.tintColor = [UIColor whiteColor];

self.navigationItem.leftBarButtonItem = LeftButton;

}

- (void)back

{

[self.navigationController popViewControllerAnimated:YES];

}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section

{

return 1;

}

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

{

static NSString * reuseID = @"cell";

UITableViewCell * cell = [tableView dequeueReusableCellWithIdentifier:reuseID];

if (!cell) {

cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:reuseID];

}

cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;

cell.textLabel.text =@"清除缓存";

cell.detailTextLabel.text = self.cacheSize;

cell.selectionStyle = UITableViewCellSeparatorStyleSingleLine;

[self myClearCacheAction:NO];

return cell;

}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath

{

if ([self.cacheSize isEqualToString:@"0.00MB"]) {

[self alertView:@"当前无缓存！" cancel:@""];

}

else

{

[self alertView:@"确认清除缓存？" cancel:@"取消"];

}

}

- (void)alertView:(NSString *)alertTitle cancel:(NSString *)cancelTitle

{

UIAlertController *alertController = [UIAlertController alertControllerWithTitle:alertTitle message:@"" preferredStyle:UIAlertControllerStyleAlert];

UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:cancelTitle style:UIAlertActionStyleCancel handler:nil];

UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"好的" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {

if ([alertTitle isEqualToString:@"确认清除缓存？"]) {

//清除缓存

[self myClearCacheAction:YES];

}

}];

if ([cancelTitle isEqualToString:@""]) {

[alertController addAction:okAction];

}

else

{

[alertController addAction:cancelAction];

[alertController addAction:okAction];

}

[self presentViewController:alertController animated:YES completion:nil];

}

//清理缓存

-(void)myClearCacheAction:(BOOL)isClear

{

if (isClear == YES) {

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

NSString *cachePath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) objectAtIndex:0];

NSArray *files = [[NSFileManager defaultManager] subpathsAtPath:cachePath];

for (NSString *p in files) {

NSError *error;

NSString *path = [cachePath stringByAppendingPathComponent:p];

if ([[NSFileManager defaultManager] fileExistsAtPath:path]) {

//清理缓存文件

[[NSFileManager defaultManager] removeItemAtPath:path error:&error];

}

}

[self performSelectorOnMainThread:@selector(clearCacheSuccess) withObject:nil waitUntilDone:YES];

});

}

else

{

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{

NSString *cachePath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) objectAtIndex:0];

CGFloat fileSize = [self folderSizeAtPath:cachePath];

dispatch_async(dispatch_get_main_queue(), ^{

NSString * t = [NSString stringWithFormat:@"%.2fMB",fileSize];

self.cacheSize = t;

NSIndexPath *indexPath=[NSIndexPath indexPathForRow:0 inSection:0];

[self.tableView reloadRowsAtIndexPaths:[NSArray arrayWithObjects:indexPath,nil] withRowAnimation:UITableViewRowAnimationNone];

});

});

}

}

-(void)clearCacheSuccess

{

NSLog(@"缓存已清除！");

}

//计算目录下所有文件大小

- (CGFloat)folderSizeAtPath:(NSString *)folderPath

{

NSFileManager *manager = [NSFileManager defaultManager];

if (![manager fileExistsAtPath:folderPath]) {

return 0;

}

NSEnumerator *childFilesEnumerator = [[manager subpathsAtPath:folderPath] objectEnumerator];

NSString *fileName = nil;

long long folderSize = 0;

while ((fileName = [childFilesEnumerator nextObject]) != nil) {

NSString *fileAbsolutePath = [folderPath stringByAppendingPathComponent:fileName];

folderSize += [self fileSizeAtPath:fileAbsolutePath];

}

return folderSize/(1024.0*1024.0);

}

//计算文件大小

- (long long)fileSizeAtPath:(NSString *)filePath

{

NSFileManager* manager = [NSFileManager defaultManager];

if ([manager fileExistsAtPath:filePath]){

return [[manager attributesOfItemAtPath:filePath error:nil] fileSize];

}

return 0;

}

// 懒加载tableview

- (UITableView *)tableView

{

if (!_tableView) {

_tableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 64, self.view.width, self.view.height) style:UITableViewStylePlain];

_tableView.dataSource = self;

_tableView.delegate  = self;

_tableView.backgroundColor = [UIColor whiteColor];

_tableView.showsHorizontalScrollIndicator = NO;

_tableView.showsVerticalScrollIndicator = NO;

_tableView.tableFooterView = [[UIView alloc] initWithFrame:CGRectZero];

_tableView.scrollEnabled = NO;

[self.view addSubview:_tableView];

}

return _tableView;

}

#pragma mark ------当页面出现和消失的时候--------

- (void)viewWillAppear:(BOOL)animated

{

[super viewWillAppear:animated];

self.tabBarController.tabBar.hidden = YES;

}

- (void)viewWillDisappear:(BOOL)animated

{

[super viewWillDisappear:animated];

self.navigationController.navigationBarHidden = NO;

self.tabBarController.tabBar.hidden = NO;

}

- (void)didReceiveMemoryWarning {

[super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

/*

#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

// Get the new view controller using [segue destinationViewController].

// Pass the selected object to the new view controller.

}

*/

@end