蓝懿 ios技术交流和心得分享12.28

于 2015-12-28 23:52:22 发布
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CC 4.0 BY-SA版权
文章标签： c语言 ios 刘国斌 技术 蓝懿iOS
版权声明：本文为博主原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接和本声明。
本文链接：https://blog.youkuaiyun.com/RenJieLi001/article/details/50422464

- (void)viewDidLoad { [super viewDidLoad]; // 1.监听通知 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textChange) name:UITextFieldTextDidChangeNotification object:self.accountField]; } //监听结束需要移除- (void)dealloc { [[NSNotificationCenter defaultCenter] removeObserver:self]; }

#import "TutorialProjectViewController.h"@implementation TutorialProjectViewController@synthesize threadValueLabel, threadProgressView, testValueLabel, threadStartButton;// ------ Tutorial code starts here ------- (IBAction) startThreaonPressed:(UIButton *)sender {        threadStartButton.hidden = YES;    threadValueLabel.text = @"0";    threadProgressView.progress = 0.0;    [NSThread detachNewThreadSelector:@selector(startTheBackgroundJob) toTarget:self withObject:nil];    }- (void)startTheBackgroundJob {      //注册一个监听者    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(Update) name:@"UpdateTableView" object:nil];      NSLog(@"1111111111");    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];    // wait for 3 seconds before starting the thread, you don't have to do that. This is just an example how to stop the NSThread for some time    [NSThread sleepForTimeInterval:3];    [self performSelectorOnMainThread:@selector(makeMyProgressBarMoving) withObject:nil waitUntilDone:NO];    [pool release];    }- (void)makeMyProgressBarMoving {    xx++;//  NSLog(@"22222222 %i",xx);    float actual = [threadProgressView progress];    threadValueLabel.text = [NSString stringWithFormat:@"%.2f", actual];    if (actual < 1) {        threadProgressView.progress = actual + 0.01;        [NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:@selector(makeMyProgressBarMoving) userInfo:nil repeats:NO];     }    if (xx==5||xx==15) {                //发出一个消息。此前注册的监听者可以发现这个消息，并且出发相应的方法        [[NSNotificationCenter defaultCenter] postNotificationName:@"UpdateTableView" object:nil];            NSLog(@"xxxxxxxxxxxxxx==3");    }    if (xx==10) {        //取消监听。        [[NSNotificationCenter defaultCenter] removeObserver:self name:@"UpdateTableView" object:nil];    }    else threadStartButton.hidden = NO;    }//受到监听的消息时，调用这个函数-(void)Update{    NSLog(@"----------sdafs");}- (IBAction) testValueSliderChanged:(UISlider *)sender {        testValueLabel.text = [NSString stringWithFormat:@"%.2f", sender.value];    }// ------ Tutorial code ends here ------- (void)didReceiveMemoryWarning {    // Releases the view if it doesn't have a superview.    [super didReceiveMemoryWarning];        // Release any cached data, images, etc that aren't in use.}- (void)viewDidUnload {    // Release any retained subviews of the main view.    // e.g. self.myOutlet = nil;}// This function is for button which takes you to the xprogress.com website- (IBAction) runXprogressComButton: (id) sender {    NSURL *url = [ [ NSURL alloc ] initWithString: @"http://www.xprogress.com/" ];    [[UIApplication sharedApplication] openURL:url];}- (void)dealloc {        // ------ Tutorial code starts here ------        [threadValueLabel release];    [threadProgressView release];    [threadStartButton release];        [testValueLabel release];        // ------ Tutorial code ends here ------        [super dealloc];}@end​

 

  • UITapGestureRecognizer
  • UIPinchGestureRecognizer
  • UIRotationGestureRecognizer
  • UISwipeGestureRecognizer
  • UIPanGestureRecognizer
  • UILongPressGestureRecognizer

从命名上不难了解這些类別所对应代表的手势，分別是 Tap（点一下）、Pinch（二指往內或往外拨动）、Rotation（旋转）、Swipe（滑动，快速移动）、Pan （拖移，慢速移动）以及 LongPress（长按）。這些手势別在使用上也很简单，只要在使用前定义并添加到对应的视图上即可。

// 定义一个 recognizer, 并加到需要偵測该手势的 UIView 元件上

-

 (void)viewDidLoad {

    UISwipeGestureRecognizer

*

 recognizer;

    // handleSwipeFrom 是偵測到手势，所要呼叫的方法

    recognizer

 = [[UISwipeGestureRecognizer alloc] initWithTarget:selfaction:@selector(handleSwipeFrom)];

    // 不同的 Recognizer 有不同的实体变数

    // 例如 SwipeGesture 可以指定方向

    // 而 TapGesture 則可以指定次數

    recognizer

.

direction

 = UISwipeGestureRecognizerDirectionUp

    [

self

.

view

 addGestureRecognizer:recognizer];

    [

recognizer

 release];

 }

 

 -

 (void)handleSwipeFrom:(UISwipeGestureRecognizer*)recognizer {

    // 触发手勢事件后，在这里作些事情

    // 底下是刪除手势的方法

    [

self

.

view

 removeGestureRecognizer:recognizer];

 }

问题來了。有些手势其实是互相关联的，例如 Tap 与 LongPress、Swipe与 Pan，或是 Tap 一次与Tap 兩次。当一個 UIView 同时添加兩个相关联的手势时，到底我这一下手指头按的要算是 Tap 还是 LongPress？如果照預设作法来看，只要「先滿足条件」的就会跳出并呼叫对应方法，举例来说，如果同时注册了 Pan 和 Swipe，只要手指头一移动就会触发 Pan 然后跳出，因而永远都不會发生 Swipe；单点与双点的情形也是一样，永远都只会触发单点，不會有双点。

那么这个问题有解吗？答案是肯定的，

UIGestureRecognizer 

有个方法叫做

requireGestureRecognizerToFail

，他可以指定某一个 recognizer，即便自己已经滿足條件了，也不會立刻触发，会等到该指定的 recognizer 确定失败之后才触发。以同时支持单点与双点的手势为例，代码如下：

-

 (void)viewDidLoad {

    // 单击的 Recognizer

    UITapGestureRecognizer

*

 singleRecognizer;

    singleRecognizer

 = [[UITapGestureRecognizer alloc] initWithTarget:selfaction:@selector(handleSingleTapFrom)];

    singleTapRecognizer

.

numberOfTapsRequired

 = 1; // 单击

    [

self

.

view

 addGestureRecognizer:singleRecognizer];

    

    // 双击的 Recognizer

    UITapGestureRecognizer

*

 double;

    doubleRecognizer

 = [[UITapGestureRecognizer alloc] initWithTarget:selfaction:@selector(handleDoubleTapFrom)];

    doubleTapRecognizer

.

numberOfTapsRequired

 = 2; // 双击

    [

self

.

view

 addGestureRecognizer:doubleRecognizer];

    

    // 关键在这一行，如果双击确定偵測失败才會触发单击

    [

singleRecognizer

 requireGestureRecognizerToFail:doubleRecognizer];

    [

singleRecognizer

 release];

    [

doubleRecognizer

 release];

}

学习ios  重要还是要理清楚思路  在做或者看老师代码的时候 自己多想想为什么  不要自己看着就抄       另外还是要推荐一下 蓝懿IOS这个培训机构  和刘国斌老师刘国斌老师还是很有名气的，听朋友说刘老师成立了蓝懿iOS，，老师讲课方式很独特，能够尽量让每个人都能弄明白，有的比较难懂的地方，如果有的地方还是不懂得话，老师会换个其它方法再讲解，这对于我们这些学习iOS的同学是非常好的，多种方式的讲解会理解得更全面，这个必须得给个赞，嘻嘻，还有就是这里的学习环境很好，很安静，可以很安心的学习，安静的环境是学习的基础，小班讲课，每个班20几个学生，学习氛围非常好，每天都学到9点多才离开教室，练习的时间很充裕，而且如果在练习的过程中有什么困难，随时可以向老师求助，不像其它机构，通过视频教学，有的甚至学完之后都看不到讲师本人，问点问题都不方便，这就是蓝懿与其它机构的区别，相信在刘国斌老师的细心指导下，每个蓝懿学员都能找到满意的工作，加油！

                                                                  写博客第七十九天；

                                                                              QQ:565803433

​

​

  1.     [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillShow:)
                                                 name:UIKeyboardWillShowNotification
                                               object:nil];
    
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardShow:)
                                                 name:UIKeyboardDidShowNotification
                                               object:nil];
    
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillHide:)
                                                 name:UIKeyboardWillHideNotification
                                               object:nil];
    
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardHide:)
                                                 name:UIKeyboardDidHideNotification
                                               object:nil];
    复制代码
  2. 在键盘将要出现和隐藏的回调中，加入动画。
    复制代码
    - (void)keyboardWillShow:(NSNotification *)notif {
    if (self.hidden == YES) {
        return;
    }
    
    CGRect rect = [[notif.userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
    CGFloat y = rect.origin.y;
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:0.25];
    NSArray *subviews = [self subviews];
    for (UIView *sub in subviews) {
        
        CGFloat maxY = CGRectGetMaxY(sub.frame);
        if (maxY > y - 2) {
            sub.center = CGPointMake(CGRectGetWidth(self.frame)/2.0, sub.center.y - maxY + y - 2);
        }
    }
    [UIView commitAnimations];
}

- (void)keyboardShow:(NSNotification *)notif {
    if (self.hidden == YES) {
        return;
    }
}

- (void)keyboardWillHide:(NSNotification *)notif {
    if (self.hidden == YES) {
        return;
    }
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:0.25];
    NSArray *subviews = [self subviews];
    for (UIView *sub in subviews) {
        if (sub.center.y < CGRectGetHeight(self.frame)/2.0) {
            sub.center = CGPointMake(CGRectGetWidth(self.frame)/2.0, CGRectGetHeight(self.frame)/2.0);
        }
    }
    [UIView commitAnimations];
}

- (void)keyboardHide:(NSNotification *)notif {
    if (self.hidden == YES) {
        return;
    }
}
    复制代码
  1.     [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillShow:)
                                                 name:UIKeyboardWillShowNotification
                                               object:nil];
    
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardShow:)
                                                 name:UIKeyboardDidShowNotification
                                               object:nil];
    
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardWillHide:)
                                                 name:UIKeyboardWillHideNotification
                                               object:nil];
    
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(keyboardHide:)
                                                 name:UIKeyboardDidHideNotification
                                               object:nil];
    复制代码
  2. 在键盘将要出现和隐藏的回调中，加入动画。
    复制代码
    - (void)keyboardWillShow:(NSNotification *)notif {
    if (self.hidden == YES) {
        return;
    }
    
    CGRect rect = [[notif.userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue];
    CGFloat y = rect.origin.y;
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:0.25];
    NSArray *subviews = [self subviews];
    for (UIView *sub in subviews) {
        
        CGFloat maxY = CGRectGetMaxY(sub.frame);
        if (maxY > y - 2) {
            sub.center = CGPointMake(CGRectGetWidth(self.frame)/2.0, sub.center.y - maxY + y - 2);
        }
    }
    [UIView commitAnimations];
}

- (void)keyboardShow:(NSNotification *)notif {
    if (self.hidden == YES) {
        return;
    }
}

- (void)keyboardWillHide:(NSNotification *)notif {
    if (self.hidden == YES) {
        return;
    }
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:0.25];
    NSArray *subviews = [self subviews];
    for (UIView *sub in subviews) {
        if (sub.center.y < CGRectGetHeight(self.frame)/2.0) {
            sub.center = CGPointMake(CGRectGetWidth(self.frame)/2.0, CGRectGetHeight(self.frame)/2.0);
        }
    }
    [UIView commitAnimations];
}

- (void)keyboardHide:(NSNotification *)notif {
    if (self.hidden == YES) {
        return;
    }
}
    复制代码
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