1.根据字体大小的计算出字符串的长和宽
CGSize nameSize = [name sizeWithAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIFont systemFontOfSize:14],NSFontAttributeName, nil]];
2.通过生日计算年龄
// calculate age by birthday
// birthday : YYYYMMDD
// age: *岁*个月*天
- (NSString *)ageStringByBirthday:(NSString *)birthday{
//年齢計算
NSDateFormatter *inputFormatter = [[NSDateFormatter alloc] init];
[inputFormatter setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"zh_CN"] ] ;
[inputFormatter setDateFormat:@"yyyyMMdd"];
NSDate* inputDate = [inputFormatter dateFromString:birthday];
NSDate *today = [NSDate date];
NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
NSDateComponents *dayComponents = [gregorian components:NSCalendarUnitYear | NSCalendarUnitMonth| NSCalendarUnitDay fromDate:inputDate toDate:today options:0];
long year = [dayComponents year];
long month = [dayComponents month];
long day = [dayComponents day];
NSString *result = [NSString stringWithFormat:@"%li岁%li个月%li天",year,month,day];
return result;
}
3.为右边的导航按钮设置弹簧距离
UIButton* rightBtn= [UIButton buttonWithType:UIButtonTypeCustom];
rightBtn.titleLabel.font = [UIFont systemFontOfSize:11];
[rightBtn setTitleColor:[UIColor colorWithRed:255.0/255 green:93.0/255 blue:93.0/255 alpha:1] forState:(UIControlStateNormal)];
rightBtn.frame = CGRectMake(self.view.bounds.size.width-70, 20, 60, 44);
UIBarButtonItem* rightBtnItem = [[UIBarButtonItem alloc]initWithCustomView:rightBtn];
[rightBtn addTarget:self action:@selector(attentionBtnClick:) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *spaceItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:(UIBarButtonSystemItemFixedSpace) target:nil action:nil];
spaceItem.width = -12;
self.navigationItem.rightBarButtonItems = @[spaceItem, rightBtnItem];
4.使得tableview在界面启动后定位在某一行
NSIndexPath *idxPath = [NSIndexPath indexPathForRow:5 inSection:0];
[self.tableView scrollToRowAtIndexPath:idxPath atScrollPosition:UITableViewScrollPositionMiddle animated:NO]
5.给定宽度和字体大小计算字符串的高度
- (CGSize)getHeightText:(NSString*)text
{
NSDictionary *attribute = @{NSFontAttributeName: [UIFont systemFontOfSize:14]};
CGSize size = [text boundingRectWithSize:CGSizeMake(kWindowW-COMMON_CARD_MARGIN*2-105, MAXFLOAT) options: NSStringDrawingTruncatesLastVisibleLine | NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:attribute context:nil].size;
return size;
}
6.检测是否是手机号码
-(BOOL)isMobileNumber:(NSString*)mobileNum
{
//手机号码
//移动：134[0-8],135,136,137,138,139,150,151,157,158,159,182,187,188
//联通：130,131,132,152,155,156,185,186
//电信：133,1349,153,180,189
NSString*MOBILE=@"^1(3[0-9]|5[0-35-9]|8[025-9])\\d{8}$";
//中国移动：China Mobile
NSString*CM=@"^1(34[0-8]|(3[5-9]|5[017-9]|8[278])\\d)\\d{7}$";
// 中国联通：China Unicom
NSString*CU=@"^1(3[0-2]|5[256]|8[56])\\d{8}$";
// 中国电信：China Telecom
NSString*CT=@"^1((33|53|8[09])[0-9]|349)\\d{7}$";
// 大陆地区固话及小灵通
// NSString * PHS = @"^0(10|2[0-5789]|\\d{3})\\d{7,8}$";
NSPredicate*regextestmobile=[NSPredicate predicateWithFormat:@"SELF MATCHES %@",MOBILE];
NSPredicate*regextestcm=[NSPredicate predicateWithFormat:@"SELF MATCHES %@",CM];
NSPredicate*regextestcu=[NSPredicate predicateWithFormat:@"SELF MATCHES %@",CU];
NSPredicate*regextestct=[NSPredicate predicateWithFormat:@"SELF MATCHES %@",CT];
if(([regextestmobile evaluateWithObject:mobileNum]==YES)||([regextestcm evaluateWithObject:mobileNum]==YES)||([regextestct evaluateWithObject:mobileNum]==YES)||([regextestcu evaluateWithObject:mobileNum]==YES)){
return YES;
}else{
return NO;
}
}
7.怎么画虚线
- (instancetype)initWithFrame:(CGRect)frame
{
if (self = [super initWithFrame:frame]) {
[self drawRect:frame];
}
return self;
}
-(void)drawRect:(CGRect)rect{
// self.layer.cornerRadius = 10;
UIView *lineView = [[UIView alloc]init];
lineView.frame = CGRectMake(12, rect.size.height-1,rect.size.width-12*2, 1);
[DashedLineView drawDashLine:lineView lineLength:4 lineSpacing:3
lineColor:kRTColorWithHEX(0xd0d0d0, 1.0)];
[self addSubview:lineView];
}
/**
** lineView: 需要绘制成虚线的view
** lineLength: 虚线的宽度
** lineSpacing: 虚线的间距
** lineColor: 虚线的颜色
**/
+ (void)drawDashLine:(UIView *)lineView lineLength:(int)lineLength lineSpacing:(int)lineSpacing lineColor:(UIColor *)lineColor
{
CAShapeLayer *shapeLayer = [CAShapeLayer layer];
[shapeLayer setBounds:lineView.bounds];
[shapeLayer setPosition:CGPointMake(CGRectGetWidth(lineView.frame) / 2, CGRectGetHeight(lineView.frame))];
[shapeLayer setFillColor:[UIColor clearColor].CGColor];
// 设置虚线颜色为blackColor
[shapeLayer setStrokeColor:lineColor.CGColor];
// 设置虚线宽度
[shapeLayer setLineWidth:CGRectGetHeight(lineView.frame)];
[shapeLayer setLineJoin:kCALineJoinRound];
// 设置线宽，线间距
[shapeLayer setLineDashPattern:[NSArray arrayWithObjects:[NSNumber numberWithInt:lineLength], [NSNumber numberWithInt:lineSpacing], nil]];
// 设置路径
CGMutablePathRef path = CGPathCreateMutable();
CGPathMoveToPoint(path, NULL, 0, 0);
CGPathAddLineToPoint(path, NULL, CGRectGetWidth(lineView.frame), 0);
[shapeLayer setPath:path];
CGPathRelease(path);
// 把绘制好的虚线添加上来
[lineView.layer addSublayer:shapeLayer];
}```
8.把图片保存到相册中
- (void)save:(UIBarButtonItem *)sender {
UIGraphicsBeginImageContext(self.hmView.bounds.size);
CGContextRef ctx = UIGraphicsGetCurrentContext();
[self.hmView.layer renderInContext:ctx];
UIImage * image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageWriteToSavedPhotosAlbum(image, NULL, NULL, NULL);
}
9.创建单一颜色的图片然后设置UIControlStateHighlighted状态
- (UImage *)imageWithColor:(UIColor *)color size:(CGSize)size {
CGRect rect = CGRectMake(0, 0, size.width, size.height);
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, [color CGColor]);
CGContextFillRect(context, rect);
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
10.UIView中的坐标转换
// 将像素point由point所在视图转换到目标视图view中，返回在目标视图view中的像素值
- (CGPoint)convertPoint:(CGPoint)point toView:(UIView *)view;
// 将像素point从view中转换到当前视图中，返回在当前视图中的像素值
- (CGPoint)convertPoint:(CGPoint)point fromView:(UIView *)view;
// 将rect由rect所在视图转换到目标视图view中，返回在目标视图view中的rect
- (CGRect)convertRect:(CGRect)rect toView:(UIView *)view;
// 将rect从view中转换到当前视图中，返回在当前视图中的rect
- (CGRect)convertRect:(CGRect)rect fromView:(UIView *)view;
// controllerA 中有一个UITableView, UITableView里有多行UITableVieCell，cell上放有一个button
// 在controllerA中实现:
CGRect rc = [cell convertRect:cell.btn.frame toView:self.view];
或
CGRect rc = [self.view convertRect:cell.btn.frame fromView:cell];
// 此rc为btn在controllerA中的rect
或当已知btn时：
CGRect rc = [btn.superview convertRect:btn.frame toView:self.view];
或
CGRect rc = [self.view convertRect:btn.frame fromView:btn.superview];
11.颜色：rgb，和16进制
# define kRTColorWihRGB(R,G,B) [UIColor colorWithRed:R/255.0 green:G/255.0 blue:B/255.0 alpha:1.0]
# define kRTColorWithHEX(hex,opa) [UIColor colorWithRed:((float)((hex & 0XFF0000)>>16))/255.0 green:((float)((hex & 0X00FF00)>>8))/255.0 blue:((float)(hex & 0X0000FF))/255.0 alpha:opa]
12.把数据变成三位加逗号的数据类型
-(NSString *)formatNumber:(double)num{ NSNumberFormatter *formatterCurrency = [[NSNumberFormatter alloc] init]; formatterCurrency.numberStyle = NSNumberFormatterDecimalStyle; [formatterCurrency setMaximumFractionDigits:2]; return [formatterCurrency stringFromNumber: @(num)]; }
13. 把科学计数法变为普通数
NSString *str = @"1.2808245E7";
NSRange eSite = [str rangeOfString:@"E"];
double fund = [[str substringWithRange:NSMakeRange(0, eSite.location)] doubleValue]; //把E前面的数截取下来当底数
double top = [[str substringFromIndex:eSite.location + 1] doubleValue]; //把E后面的数截取下来当指数
double result = fund * pow(10.0, top);
}
14.一些判断的方法
-(BOOL) isKindOfClass: classObj 用来判断是否是某个类或其子类的实例
-(BOOL) isMemberOfClass: classObj 用来判断是否是某个类的实例
-(BOOL) respondsToSelector: selector 用来判断是否有以某个名字命名的方法(被封装在一个selector的对象里传递)
+(BOOL) instancesRespondToSelector: selector 用来判断实例是否有以某个名字命名的方法. 和上面一个不同之处在于, 前面这个方法可以用在实例和类上，而此方法只能用在类上.
15.UIDatePicker的简单使用
UIDatePicker *dp = [[UIDatePicker alloc] init];
[dp setDate:[NSDate date] animated:YES]; // 设置日期控件值
[dp addTarget:self
action:@selector(dateValueChange:)
forControlEvents:UIControlEventValueChanged]; // 时间改变时触发此事件
设置日期选择控件的地区
[dp setLocale:[[NSLocale alloc]initWithLocaleIdentifier:@"zh_CN"]];
NSDateFormatter *form = [[NSDateFormatter alloc] init]; // 定义时间 格式
[form setDateFormat:@"yyyy/MM/DD HH:mm"];
NSString *dateString = [form stringFromDate:dp.date];
dp.minuteInterval = 30; // 最小间隔30分钟
dp.minimumDate = [NSDate date]; // 最小值
dp.maximumDate = [NSDate dateWithTimeIntervalSinceNow:60*60*24*31]; // 最大值
dp.datePickerMode = UIDatePickerModeTime; // 时间模式
dp.datePickerMode = UIDatePickerModeDate; // 日期模式
dp.datePickerMode = UIDatePickerModeDateAndTime; // 日期和时 间模式
dp.datePickerMode = UIDatePickerModeCountDownTimer; // 倒计时模式
16 ，计算据今天两个月的日期
//创建日历
NSCalendar *calendar = [NSCalendar currentCalendar];
NSDateComponents *com = [calendar components:NSCalendarUnitYear|NSCalendarUnitMonth|NSCalendarUnitDay fromDate:[NSDate date]];
com.year = 0;
com.month = 2;
com.day = 0;
NSDate *date = [calendar dateByAddingComponents:com toDate:[NSDate date]options:0];
17 ，导航的问题
-
- (void)initNavigationBar:(UINavigationBar *)navigationBar{ // 设置导航栏的背景颜色 UIColor* backgroundColor = [UIColor colorWithRed:(float)0x20/0xff green:(float)0x24/0xff blue:(float)0x2c/0xff alpha:1.0]; [navigationBar setTranslucent:NO]; [navigationBar setBarTintColor:backgroundColor]; [navigationBar setBackgroundColor:backgroundColor]; // 设置导航栏上的标题的颜色 navigationBar.titleTextAttributes = @{NSFontAttributeName:[UIFont systemFontOfSize:18],NSForegroundColorAttributeName:kRTColorWithHEX(0xffffff, 1)}; for (UINavigationItem *item in [navigationBar items]) { item.leftBarButtonItem.tintColor =[UIColor whiteColor]; } // 去掉导航栏的边界线 [navigationBar setBackgroundImage:[[UIImage alloc] init] forBarMetrics:UIBarMetricsDefault]; navigationBar.shadowImage = [[UIImage alloc] init]; }创建block匿名函数之前一般需要对self进行weak化，否则造成循环引用无法释放controller:
__weak MyController *weakSelf = self 或者 __weak __typeof(self) weakSelf = self;
