去除数组中重复的对象
NSArray*newArr=[oldArr valueForKeyPath:@“@distinctUnionOfObjects.self"];
获取window
+(UIWindow*)getWindow{
UIWindow*win=nil;
//[UIApplication sharedApplication].keyWindow;
for(id item in [UIApplication sharedApplication].windows){
if([itemclass]==[UIWindowclass]){
if(!((UIWindow*)item).hidden){
win=item;
break;
}
}
}
returnwin;
}
修改textField的placeholder的字体颜色、大小
[textField setValue:[UIColor redColor]forKeyPath:@"_placeholderLabel.textColor"];
[textField setValue:[UIFont boldSystemFontOfSize:16]forKeyPath:@"_placeholderLabel.font"];
清理app缓存
-(void)handleClearView{//删除两部分//1.删除 sd 图片缓存//先清除内存中的图片缓存
[[SDImageCache sharedImageCache]clearMemory];
//清除磁盘的缓存
[[SDImageCache sharedImageCache]clearDisk];
//2.删除自己缓存
NSString*myCachePath=[NSHomeDirectory()stringByAppendingPathComponent:@"Library/Caches"];[[NSFileManager defaultManager]removeItemAtPath:myCachePath error:nil];
}
身份证号验证
-(BOOL)validateIdentityCard{
BOOLflag;
// if(self.length <=0){
// flag=NO;
// return flag;
//
// }
NSString*regex2=@"^(\\d{14}|\\d{17})(\\d|[xX])$";
NSPredicate*identityCardPredicate=[NSPredicatepredicateWithFormat:@"SELF MATCHES %@",regex2];
return[identityCardPredicateevaluateWithObject:self];
}
KVO监听某个对象的属性
// 添加监听者
[self addObserver:self forKeyPath:property options:NSKeyValueObservingOptionNew context:nil];
// 当监听的属性值变化的时候会来到这个方法
-(void)observeValueForKeyPath:(NSString*)keyPathofObject:(id)objectchange:(NSDictionary*)changecontext:(void*)context{
if([keyPathisEqualToString:@"property"]){
// [self textViewTextChange];
}else{}
}
移除字符串中的空格和换行
+(NSString*)removeSpaceAndNewline:(NSString*)str{
NSString*temp=[str stringByReplacingOccurrencesOfString:@" "withString:@""];
temp=[tempstringByReplacingOccurrencesOfString:@"\r"withString:@""];
temp=[tempstringByReplacingOccurrencesOfString:@"\n"withString:@""];
return temp;
}
UILabel设置内边距
-(void)drawTextInRect:(CGRect)rect{// 边距，上左下右
UIEdgeInsetsinsets={0,5,0,5};
[selfdrawTextInRect:UIEdgeInsetsInsetRect(rect,insets)];
}
为UIView某个角添加圆角// 左上角和右下角添加圆角
UIBezierPath*maskPath = [UIBezierPath bezierPathWithRoundedRect:self.view.bounds byRoundingCorners:(UIRectCornerTopLeft|UIRectCornerBottomRight )cornerRadii:CGSizeMake(20,20)];
CAShapeLayer*maskLayer = [CAShapeLayer layer];
maskLayer.frame=self.view.bounds;
maskLayer.path= maskPath.CGPath;
self.view.layer.mask= maskLayer;
UITextView中打开或禁用复制，剪切，选择，全选等功能
// 继承UITextView重写这个方法
-(BOOL)canPerformAction:(SEL)action withSender:(id)sender{// 返回NO为禁用，YES为开启
// 粘贴
if(action==@selector(paste:))returnNO;
// 剪切
if(action==@selector(cut:))returnNO;
// 复制
if(action==@selector(copy:))returnNO;
// 选择
if(action==@selector(select:))returnNO;
// 选中全部
if(action==@selector(selectAll:))returnNO;
// 删除
if(action==@selector(delete:))returnNO;
// 分享
if(action==@selector(share))returnNO;
return [super canPerformAction:action withSender:sender];
}
