NSTimer+UIScrollView

发表于 2017-11-27 |

在此备注一下RunLoop的知识
RunLoop的运行模式(CFRunLoopModeRef)
一个 RunLoop包含若干个Mode，每个Mode又包含若干个Source/Timer/Observer，每次RunLoop启动时，只能指定其中一个Mode，这个Mode被称作 CurrentMode如果需要切换Mode，只能退出Loop，再重新指定一个Mode进入。
系统默认模式
1 NSDefaultRunLoopMode：App的默认Mode，通常主线程是在这个Mode下运行
2 UITrackingRunLoopMode：界面跟踪Mode，用于ScrollView 追踪触摸滑动，保证界面滑动时不受其他 Mode 影响
3 UIInitializationRunLoopMode:在刚启动App时第进入的第一个 Mode，启动完成后就不再使用
4 GSEventReceiveRunLoopMode: 接受系统事件的内部 Mode，通常用不到
5 NSRunLoopCommonModes:这是一个占位用的Mode，不是一种真正的Mode

// 新建NSTimer对象
self.testTimer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(testTimerlog) userInfo:nil repeats:YES];

// 将NSTimer添加到RunLoop中,并且告诉系统,当前Tiemr只有在RunLoop的默认模式下才有效
[[NSRunLoop currentRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode];
// 所以在UITrackingRunLoopMode模式下，定时器的方法不会执行，但定时器仍计时

将NSTimer添加到RunLoop中,并且告诉系统,当前Tiemr只有在Tracking的默认模式下才有效

1	[[NSRunLoop currentRunLoop] addTimer:timer forMode:UITrackingRunLoopMode];

将NSTimer添加到RunLoop中,并且告诉系统,在所有被”标记”common的模式都可以运行,UITrackingRunLoopMode和kCFRunLoopDefaultMode都被标记为了common模式,所以只需要将timer的模式设置为forMode:NSRunLoopCommonModes,就可以在默认模式和追踪模式都能够运行

1	[[NSRunLoop currentRunLoop] addTimer:timer forMode:NSRunLoopCommonModes];

如果是通过scheduledTimerWithTimeInterval创建的NSTimer, 默认就会添加到RunLoop得DefaultMode中 , 所以它会自动运行

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NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:3.0 target:self selector:@selector(show) userInfo:nil repeats:YES];
// 虽然默认已经添加到DefaultMode中,但是我们也可以自己修改它的模式
[[NSRunLoop currentRunLoop] addTimer:timer forMode:NSRunLoopCommonModes];

iOS阻止子视图相应父视图事件

发表于 2017-11-27 |

实现如下代理方法

#pragma mark - UIGestureRecognizerDelegate
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
    if ([touch.view isDescendantOfView:你想屏蔽点击事件的View]) {
        return NO;
    }
    return YES;
}

iOS选择照片九宫格动态布局

发表于 2017-11-27 |

直接上源码

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iOS的桌面背景运动效果

发表于 2017-11-27 |

_backgroundImage = [[UIImageView alloc] initWithFrame:CGRectMake(-50, -50, Screen_width+100, Screen_Height+100)];
    _backgroundImage.image = [UIImage imageNamed:@"bg_1"];
    [self.view addSubview:_backgroundImage];
    
    UIInterpolatingMotionEffect * backEffX = [[UIInterpolatingMotionEffect alloc] initWithKeyPath:@"center.x" type:UIInterpolatingMotionEffectTypeTiltAlongHorizontalAxis];// type表示沿水平方向运行效果
    backEffX.maximumRelativeValue = @(-50);
    backEffX.minimumRelativeValue = @(50);
    [self.backgroundImage addMotionEffect:backEffX];
    
    UIInterpolatingMotionEffect * backEffY = [[UIInterpolatingMotionEffect alloc] initWithKeyPath:@"center.y" type:UIInterpolatingMotionEffectTypeTiltAlongVerticalAxis];
    backEffY.maximumRelativeValue = @(-50);
    backEffY.minimumRelativeValue = @(50);
    [self.backgroundImage addMotionEffect:backEffY];

iOS根据身份证号获取年龄生日性别

发表于 2017-11-27 |

//根据身份证号获取生日
-(NSString *)birthdayStrFromIdentityCard:(NSString *)numberStr
{
NSMutableString *result = [NSMutableString stringWithCapacity:0];
NSString *year = nil;
NSString *month = nil;

BOOL isAllNumber = YES;
NSString *day = nil;
if([numberStr length]<14)
return result;

//**截取前14位
NSString *fontNumer = [numberStr substringWithRange:NSMakeRange(0, 13)];

//**检测前14位否全都是数字;
const char *str = [fontNumer UTF8String];
const char *p = str;
while (*p!='\0') {
if(!(*p>='0'&&*p<='9'))
isAllNumber = NO;
p++;
}
if(!isAllNumber)
return result;

year = [numberStr substringWithRange:NSMakeRange(6, 4)];
month = [numberStr substringWithRange:NSMakeRange(10, 2)];
day = [numberStr substringWithRange:NSMakeRange(12,2)];

[result appendString:year];
[result appendString:@"-"];
[result appendString:month];
[result appendString:@"-"];
[result appendString:day];
return result;
}

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UILabel在设置了行间距和字间距后计算高度

发表于 2017-11-27 |

- (CGFloat)textHeightFromTextString:(NSString *)text width:(CGFloat)textWidth fontSize:(CGFloat)textSize {
    
    //设置行间距
    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
    [paragraphStyle setLineSpacing:3];
    
    //把行间距和字间距加入高度计算的方法
    NSDictionary*attrs =@{NSFontAttributeName: [UIFont systemFontOfSize:textSize],NSParagraphStyleAttributeName:paragraphStyle,NSKernAttributeName:@1.5f};
    
    CGRect rect = [text boundingRectWithSize:CGSizeMake(textWidth, MAXFLOAT) options:NSStringDrawingTruncatesLastVisibleLine|NSStringDrawingUsesFontLeading|NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingTruncatesLastVisibleLine attributes:attrs context:nil];
    
    //返回计算出的行高
    return ceilf(rect.size.height);
}

UILabel *msgLab = [[UILabel alloc] initWithFrame:CGRectMake(15, 10, frame.size.width-30, 100)];
        msgLab.backgroundColor = [UIColor clearColor];
msgLab.textColor = [[UIColor whiteColor] colorWithAlphaComponent:.8]; 
msgLab.numberOfLines = 0;
        msgLab.lineBreakMode = NSLineBreakByWordWrapping;
        NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:[bannerDic objectForKey:@"msgText"]];
        
        NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
        [paragraphStyle setLineSpacing:3];//调整行间距
        //这个设置在字体无法显示时一省略号表示
        paragraphStyle.lineBreakMode = NSLineBreakByTruncatingTail;
        
        [attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, [attributedString length])];
        
        [attributedString addAttribute:NSFontAttributeName value:msgFont range:NSMakeRange(0, attributedString.length)];
        msgLab.attributedText = attributedString;
        [self addSubview:msgLab];

判断图片格式

发表于 2017-11-27 |

+(NSString *)typeForImageData:(NSData *)data
{
    uint8_t c;
    [data getBytes:&c length:1];
    switch (c) {
        case 0xFF:
            return @"jpeg";
            
        case 0x89:
            return @"png";
            
        case 0x47:
            return @"gif";
            
        case 0x49:
            
        case 0x4D:
            return @"tiff";
    }
    return nil;
}

iOS分角设置View圆角

发表于 2017-11-27 |

UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 0, Screen_width-30, 258) byRoundingCorners:UIRectCornerTopLeft | UIRectCornerTopRight cornerRadii:CGSizeMake(2, 2)];
CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
maskLayer.frame = CGRectMake(0, 0, Screen_width-30, 258);
maskLayer.path = maskPath.CGPath;
self.picTure.layer.mask = maskLayer;

注意：当分角设置View的圆角的时候要确定的知道View的绝对Frame不然会出现偏差。