iOS杂记

imagemagick 图片压缩 修改hash

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

brew install imagemagick

find . -iname "*.png" -exec echo {} \; -exec convert {} {} \;

参考

静态方法

static void SimpleObjectExample() {
    YYBook *book = [YYBook modelWithJSON:@"     \
    {                                           \
       \"name\": \"Harry Potter\",              \
       \"pages\": 512,                          \
       \"publishDate\": \"2010-01-01\"          \
    }"];
    NSString *bookJSON = [book modelToJSONString];
    NSLog(@"Book: %@", bookJSON);
}

布局

HandyFrame

队列

dispatch_queue_t queue = dispatch_queue_create("com.ios.refresh", DISPATCH_QUEUE_CONCURRENT);
    dispatch_group_t group = dispatch_group_create();

dispatch_group_enter(group);
[self ask_clubInfo:^{
    dispatch_group_leave(group);
}];
    
dispatch_group_notify(group, queue, ^{
        
});

信号量

dispatch_semaphore_t semaphore = dispatch_semaphore_create(1);
dispatch_queue_t quene = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);

for (......) {

    dispatch_async(quene, ^{
    
        dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER);
    
    
        do....
        
        dispatch_semaphore_signal(semaphore);
    });

}

dispatch_async(quene, ^{
            //最后执行
            dispatch_semaphore_wait(semaphore, DISPATCH_TIME_FOREVER);
            if(finishBlock)
            {
                finishBlock(YES,dataList);
            }
            dispatch_semaphore_signal(semaphore);
        });

属性的synthesize dynamic

1、@property有两个对应的词，一个是@synthesize，一个是@dynamic。如果@synthesize和@dynamic都没写，那么默认的就是@syntheszie var = _var;

2、@synthesize的语义是如果你没有手动实现setter方法和getter方法，那么编译器会自动为你加上这两个方法。

3、@dynamic告诉编译器,属性的setter与getter方法由用户自己实现，不自动生成。（当然对于readonly的属性只需提供getter即可）。假如一个属性被声明为@dynamic var，然后你没有提供@setter方法和@getter方法，编译的时候没问题，但是当程序运行到instance.var =someVar，由于缺setter方法会导致程序崩溃；或者当运行到 someVar = var时，由于缺getter方法同样会导致崩溃。编译时没问题，运行时才执行相应的方法，这就是所谓的动态绑定。

结构体定义

struct SpaceImg{
    CGFloat img1_left;
    CGFloat img1_right;
    CGFloat img2_left;
    CGFloat img2_right;
};
typedef struct SpaceImg SpaceImg;

XCode插件

@2x转@3x,imageAssets操作

系统音效

参考链接

Block定义

int(^myBlock)(int) = ^(int num){
    return num * 7;
};

// 如果没有参数列表,在赋值时参数列表可以省略
void(^aVoidBlock)() = ^{
    NSLog(@"I am a aVoidBlock");
};

添加QQ群助手

https://qun.qq.com/join.html?has_onekey=1

表格删除添加cell的时候跳动问题

链接

iOS11 self-sizing 默认开启 会自动计算cell的高度 contentsize和contentOffset会发生变化

self.tableView.estimatedRowHeight = 0;
self.tableView.estimatedSectionHeaderHeight = 0;
self.tableView.estimatedSectionFooterHeight = 0;

部分圆角

    UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:rect byRoundingCorners:UIRectCornerTopLeft | UIRectCornerTopRight cornerRadii:CGSizeMake(10, 10)];
    CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
    maskLayer.frame = rect;
    maskLayer.path = maskPath.CGPath;
    self.layer.mask = maskLayer;

iOS11 上scrollview布局向下偏移问题

automaticallyAdjustsScrollViewInsets 方法有调整

if (@available(iOS 11.0, *)) {
        self.scrollV.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
    } else {
        self.automaticallyAdjustsScrollViewInsets = NO;
    }

CAAnimation 的keypath

例子

transform.scale = 比例轉換

transform.scale.x = 宽的比例轉換

transform.scale.y = 高的比例轉換

transform.rotation.z = 平面圖的旋轉

opacity = 透明度

margin=边框间隔?

zPosition = 平面图的位置

backgroundColor = 背景色

cornerRadius = layer的角度

borderWidth = 边框宽度

contents = 内容?

bounds = 大小?

contentsRect = 内容矩形

frame = 位置

hidden = 隐藏

mask = 标记

maskToBounds

position = 位置

shadowOffset = 阴影偏移?

shadowColor = 阴影颜色

shadowRadius = 阴影角度

动画结束状态不变

animation.removedOnCompletion = NO;
animation.fillMode = kCAFillModeForwards;

监听动画过程frame

链接

// 监听MyView
- (void)startWatchMyView {
    [self stopWatchMyView];
    self.displayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(watchMyViewAction)];
    [self.displayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
}

- (void)watchMyViewAction {
    CALayer *presentationLayer = self.myView.layer.presentationLayer;
    [self handleMaskViewWithMyViewFrame:presentationLayer.frame];
}

// 停止监听MyView
- (void)stopWatchMyView {
    [self.displayLink invalidate];
    self.displayLink = nil;
    [self watchMyViewAction];
}

- (void)handleMaskViewWithMyViewFrame:(CGRect)myFrame {
    // 下面是根据myFrame 进行其他相关view的绘制
    [self.myView setNeedsDisplay];
    
    // mask处理overlayView
    self.overlayView.maskFrame = myFrame;
    [self.overlayView setNeedsDisplay];
}

作者：AlienJunX
链接：https://www.jianshu.com/p/904d6ddee257
來源：
著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。

Masonry安全区域

if (@available(iOS 11.0, *)) {
            make.bottom.equalTo(self.view.safeAreaLayoutGuideBottom);
        } else {
            make.bottom.equalTo(self.view);
        }

获取启动页图片

地址1

地址2

+ (UIImage *)getTheLaunchImage
{
    CGSize viewSize = [UIScreen mainScreen].bounds.size;

    NSString *viewOrientation = nil;
    if (([[UIApplication sharedApplication] statusBarOrientation] == UIInterfaceOrientationPortraitUpsideDown) || ([[UIApplication sharedApplication] statusBarOrientation] == UIInterfaceOrientationPortrait)) {
        viewOrientation = @"Portrait";
    } else {
        viewOrientation = @"Landscape";
    }


    NSString *launchImage = nil;

    NSArray* imagesDict = [[[NSBundle mainBundle] infoDictionary] valueForKey:@"UILaunchImages"];
    for (NSDictionary* dict in imagesDict)
    {
        CGSize imageSize = CGSizeFromString(dict[@"UILaunchImageSize"]);

        if (CGSizeEqualToSize(imageSize, viewSize) && [viewOrientation isEqualToString:dict[@"UILaunchImageOrientation"]])
        {
            launchImage = dict[@"UILaunchImageName"];
        }
    }

    return [UIImage imageNamed:launchImage];

}