记录下一些不常用技巧,以防忘记,复制用。
1、获取当前的View在Window的frame:
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UIWindow * window=[[[UIApplication sharedApplication] delegate] window];
CGRect rect=[_myButton convertRect:_myButton.bounds toView:window];
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2、UIImageView 和UILabel 等一些控件,需要加这句才能setCorn
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_myLabel.layer.masksToBounds = YES ;
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3、手机上的沙盒路径要加"Documents",不然存储写入失败!mac上不用!
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[_myArray writeToFile:[[ NSHomeDirectory () stringByAppendingPathComponent:@ "Documents" ] stringByAppendingPathComponent:@ "shopCategory.plist" ] atomically: YES ];
NSArray *tempAllData = [ NSArray arrayWithContentsOfFile:[[ NSHomeDirectory () stringByAppendingPathComponent:@ "Documents" ] stringByAppendingPathComponent:@ "shopCategory.plist" ]];
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后续补充:
Document:一般需要持久的数据都放在此目录中,可以在当中添加子文件夹,iTunes备份和恢复的时候,会包括此目录。
Library:设置程序的默认设置和其他状态信息
temp:创建临时文件的目录,当iOS设备重启时,文件会被自动清除
4、图片拉伸不失真,如聊天软件对话气泡
1)、方法1,比较老的,
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UIImage *tempImage2 = [UIImage imageNamed:@ "sub.png" ];
tempImage2 = [tempImage2 stretchableImageWithLeftCapWidth:tempImage2.size.width/2 topCapHeight:0];
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2)、方法2,比较新的
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UIImage *tempImage3 = [UIImage imageNamed:@ "sub" ];
CGFloat tempH = tempImage3.size.height/2;
CGFloat tempW = tempImage3.size.width/2;
UIEdgeInsets tempEdg = UIEdgeInsetsMake(tempH, tempW, tempH, tempW);
tempImage3 = [tempImage3 resizableImageWithCapInsets:tempEdg resizingMode:UIImageResizingModeStretch];
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5、视频截取缩略图,其中CMTimeMakeWithSeconds(5,1),调整截图帧数/秒数,一般不用特意去修改,不做参数传入,除非片头一段时间都一样的视频。
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#import <AVFoundation/AVFoundation.h>
-(UIImage *)getThumbnailImage:( NSString *)videoURL
{
AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:[ NSURL fileURLWithPath:videoURL] options: nil ];
AVAssetImageGenerator *gen = [[AVAssetImageGenerator alloc] initWithAsset:asset];
gen.appliesPreferredTrackTransform = YES ;
//控制截取时间
CMTime time = CMTimeMakeWithSeconds(5, 1);
NSError *error = nil ;
CMTime actualTime;
CGImageRef image = [gen copyCGImageAtTime:time actualTime:&actualTime error:&error];
UIImage *thumb = [[UIImage alloc] initWithCGImage:image];
CGImageRelease(image);
return thumb;
}
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6、cell下划线左边顶住屏幕左边。
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cell.preservesSuperviewLayoutMargins = NO ;
cell.layoutMargins = UIEdgeInsetsZero;
cell.separatorInset = UIEdgeInsetsZero;
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7、去除xcode8冗余信息,虽然已经记住了。
OS_ACTIVITY_MODE disable
8、播放音频
1)工程内音频
1-1)、获取音频路径
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NSString *path = [[ NSBundle mainBundle] pathForResource:@ "shakebell" ofType:@ "wav" ];
NSURL *url = [ NSURL fileURLWithPath:path];
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1-2)、创建音频播放ID
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SystemSoundID soundID;
AudioServicesCreateSystemSoundID((__bridge CFURLRef _Nonnull)(url), &soundID);
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1-3)、Play
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AudioServicesPlaySystemSound(soundID);
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2)系统音频,参数为1000-1351,具体查表,如1007为“sms-received1”
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AudioServicesPlaySystemSound(1007);
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9、字体自适应
1)、固定的Frame,自适应Font大小,如数量增减,1和1000。
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[label1 setAdjustsFontSizeToFitWidth: YES ];
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2)、固定的Font,自适应Frame,用于信息类显示
3)、固定的Font,获取自适应Frame值,反过来设置Label的Frame,用于信息类显示。这里的100是等下设置Label的width,也是返回的rect.frame.size.width
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CGRect rect = [templabel.text boundingRectWithSize:CGSizeMake(100, CGFLOAT_MAX) options: NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:@{ NSFontAttributeName :templabel.font} context: nil ];
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10、AFNetworking 检测网络连接状态
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[[AFNetworkReachabilityManager sharedManager]startMonitoring];
[[AFNetworkReachabilityManager sharedManager]setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
NSLog (@ "%ld" ,status);
}];
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11、编辑相关
1)键盘事件通知
1-1)、弹出键盘可能盖住TextField。监听键盘的通知
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[[ NSNotificationCenter defaultCenter]addObserver: self selector: @selector (moveView:) name:UIKeyboardDidChangeFrameNotification object: nil ];
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1-2)、moveView方法里接收通知,tempTime是键盘动画时间,tempY是键盘当前的y轴位置。(接着要移动评论框或者移动后面的ScrollView都可以)
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CGFloat tempTime = [[noti.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue];
CGFloat tempY = [[noti.userInfo objectForKey:UIKeyboardFrameEndUserInfoKey]CGRectValue].origin.y
//重置约束条件
//self.theBottomSpace.constant = ?;
[UIView animateWithDuration:duration animations:^{
//更新约束
[ self .view layoutIfNeeded];
}];
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2)dealloc记得移除
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[[ NSNotificationCenter defaultCenter]removeObserver: self ];
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3)touchesBegan:withEvent && scrollViewDidScroll -->屏幕点击&&屏幕滑动要取消编辑状态
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[ self .view endEditing: YES ];
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12、上传图片(头像)
1-1)、把Image打成NSData
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NSData *imagedata = UIImageJPEGRepresentation(tempImage, 1.0);
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1-2)、AFNetworking的POST方法填如下。formData:POST方法里的Block参数,name:跟服务器有关,filename:随意填,mimeType:就image/jpg。
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[formData appendPartWithFileData:imagedata name:@ "imgFile" fileName:@ "idontcare.jpg" mimeType:@ "image/jpg" ];
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13、强制布局
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[ self .view layoutIfNeeded];
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14、图片双击缩放
1)scrollView才可以缩放,所以要把ImageView加在scrollView,给scrollView(这里的 self )添加手势识别。要设最大/小缩放比例!
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UITapGestureRecognizer *imageTwoTap = [[UITapGestureRecognizer alloc]initWithTarget: self action: @selector (twoTapAction:)];
imageTwoTap.numberOfTapsRequired = 2;
[ self addGestureRecognizer: imageTwoTap];
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2)第一次点哪放大哪,第二次恢复原来大小
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#define SCALE_WIDTH 60 //要放大的局部宽度大小
#define SCALE_HEIGHT 60 //要放大的局部高度大小
-( void )twoTapAction:(UITapGestureRecognizer *)tempTap
{
if ( self .zoomScale != 1.0)
{
[ self setZoomScale:1.0 animated: YES ];
}
else
{
CGPoint tempPoint = [tempTap locationInView: self ];
[ self zoomToRect:CGRectMake(tempPoint.x-SCALE_WIDTH/2, tempPoint.y-SCALE_HEIGHT/2, SCALE_WIDTH, SCALE_HEIGHT) animated: YES ];
}
}
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15、加载XIB
1)、从多个cell样式的XIB加载。只有1个cell样式,可直接lastObject加载。(先根据不同的ID取,取不到再加载。)
1-1)、获取XIB里的所有对象
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NSArray *cellArry = [[ NSBundle mainBundle] loadNibNamed: NSStringFromClass ([MyTableCell class ]) owner: self options: nil ];
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1-2)、读取对应的Cell样式,此时的参数type为枚举,或基本数据类型。
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cell = [cellArry objectAtIndex:type];
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2)、在 UIView + xxx 的类别文件里,可以添加这个类。方便加载单种Cell样式的XIB。
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+ (instancetype)viewFromXib
{
return [[[ NSBundle mainBundle] loadNibNamed: NSStringFromClass ( self ) owner: nil options: nil ] lastObject];
}
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16、常用延时执行
1)、dispatch_after
dispatch_after 代码块,一敲就出来,好像是Xcode8之后的。
2)、performSelector
-(void)performSelector: withObject: afterDelay: ;
时间: 2024-09-30 14:46:40