#在蓝懿学习iOS的日子#day15

1动态算高度：是为了修改行高的

UILabel *myLabel = [[UILabel alloc]initWithFrame:CGRectMake(100, 100, 100, 100)];

myLabel.backgroundColor = [UIColor yellowColor];

myLabel.numberOfLines = 0;

[self.view addSubview:myLabel];

myLabel.text = @"奥迪飞机";

//计算文本的高度

CGRect rect = [myLabel.text boundingRectWithSize:CGSizeMake(myLabel.bounds.size.width, CGFLOAT_MAX) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:myLabel.font} context:nil];

NSLog(@"%f",rect.size.height);

// self.myLabel.frame = CGRectMake(self.myLabel.frame.origin.x, self.myLabel.frame.origin.y, self.myLabel.frame.size.width, rect.size.height);

//修改frame里面的某一个值 可以用下面的方式

CGRect frame = myLabel.frame;

frame.size.height = rect.size.height;

myLabel.frame = frame;

}

2tableHeaderView tableFooterView相当于微博里得上下边栏

- (void)viewDidLoad {

[super viewDidLoad];

self.myLabel.text = @"adsfasdf";

}

- (void)viewDidLoad {

[super viewDidLoad];

self.myLabel.text = @"adsfasdf";

}

3.文件管理器，：便于文件的管理

self.filePaths = [NSMutableArray array];

//如果是第一次 就显示固定路径下面的内容

if (!self.direcotryPath) {

self.direcotryPath = @"/Users/ivan";

}

self.title = [self.direcotryPath lastPathComponent];

NSString *path = self.direcotryPath;

NSFileManager *fm = [NSFileManager defaultManager];

NSArray *fileNames = [fm contentsOfDirectoryAtPath:path error:nil];

for (NSString *fileName in fileNames) {

if (![fileName hasPrefix:@"."]) {

NSString *filePath = [path stringByAppendingPathComponent:fileName];

[self.filePaths addObject:filePath];

}

}

4.取地址 在文档里搜索文件

（1）// Person.h创建一个类生命两个属性

@property (nonatomic)int age;

@property (nonatomic)NSString *name;

（2）ViewController.m引用类

- (void)viewDidLoad {

[super viewDidLoad];

int x = 10;

[self changeX:&x];

NSLog(@"%d",x);

Person *p = [[Person alloc]init];

p.age = 18;

[self changeAge:&p];

NSLog(@"%d",p.age);

}

-(void)changeX:(int *)y{

*y = 5;

}

-(void)changeAge:(Person **)p1{

*p1 = [[Person alloc]init];

(*p1).age = 28;

}

5.递归

@interface ViewController ()

@property (weak, nonatomic) IBOutlet UITextField *myTF;

@property (weak, nonatomic) IBOutlet UISwitch *mySwitch;

@property (weak, nonatomic) IBOutlet UITextView *historyTV;

@property (nonatomic)int count;

@end

@implementation ViewController

- (IBAction)clicked:(id)sender {

self.historyTV.text = @"";

[self findFileInDirecotry:@"/Users/ivan/Desktop"];

self.myTF.text = @"";

//收软键盘

[self.myTF resignFirstResponder];

}

- (void)viewDidLoad {

[super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

}

-(void)findFileInDirecotry:(NSString *)path{

NSFileManager *fm = [NSFileManager defaultManager];

NSArray *fileNames = [fm contentsOfDirectoryAtPath:path error:nil];

for (NSString *fileName in fileNames) {

NSString *filePath = [path stringByAppendingPathComponent:fileName];

if (self.mySwitch.isOn) {//精确查找

if ([fileName isEqualToString:self.myTF.text]) {

NSLog(@"%@--%d",filePath,self.count++);

self.historyTV.text = [self.historyTV.text stringByAppendingFormat:@"\n%@",filePath];

}

}else{//模糊

if ([fileName rangeOfString:self.myTF.text].length>0) {

NSLog(@"%@--%d",filePath,self.count++);

self.historyTV.text = [self.historyTV.text stringByAppendingFormat:@"\n%@",filePath];

}

}

//如果是文件夹的话

BOOL isDir = NO;

if ([fm fileExistsAtPath:filePath isDirectory:&isDir]&&isDir) {

[self findFileInDirecotry:filePath];

}

}

}

6.查找工具

7.文件管理器