测试推送 工具 Easy APNs Provider
1.字符串拼接的三种
//1.截取字符串
NSString *string =@"123456d890";
NSString *str1 = [string substringToIndex:5];//截取掉下标5之前的字符串
NSLog(@"截取的值为：%@",str1);
NSString *str2 = [string substringFromIndex:3];//截取掉下标3之后的字符串
NSLog(@"截取的值为：%@",str2);
//2.匹配字符串
NSString *string =@"sd是sfsfsAdfsdf";
NSRange range = [string rangeOfString:@"Ad"];//匹配得到的下标
NSLog(@"rang:%@",NSStringFromRange(range));
string = [string substringWithRange:range];//截取范围内的字符串
NSLog(@"截取的值为：%@",string);
//3.分隔字符串
NSString *string =@"sdfsfsfsAdfsdf";
NSArray *array = [string componentsSeparatedByString:@"A"]; //从字符A中分隔成2个元素的数组
NSLog(@"array:%@",array); //结果是adfsfsfs和dfsdf
2.iOS11 关于导航栏searchbar 的调整
[[UISearchBar appearance] setSearchFieldBackgroundImage:[self searchFieldBackgroundImage] forState:UIControlStateNormal];
UITextField *txfSearchField = [_searchChatRecords valueForKey:@"_searchField"];
[txfSearchField setDefaultTextAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:13.5]}];
调用方法
//调用方法
- (UIImage*)searchFieldBackgroundImage {
UIColor*color = [UIColor whiteColor];
CGFloat cornerRadius = 5;
CGRect rect =CGRectMake(0,0,28,28);
UIBezierPath*roundedRect = [UIBezierPath bezierPathWithRoundedRect:rect cornerRadius:cornerRadius];
roundedRect.lineWidth=0;
UIGraphicsBeginImageContextWithOptions(rect.size,NO,0.0f);
[color setFill];
[roundedRect fill];
[roundedRect stroke];
[roundedRect addClip];
UIImage *image =UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
3.关于时间转换成系统时区
北京时间与UTC时间相差8个小时，因此每次会转换成当前时间，这个方法是转换成系统时区的时间
- (NSTimeInterval)getNowDateWithDate:(NSDate *)date{
NSTimeZone *zone = [NSTimeZone systemTimeZone]; // 获得系统的时区
NSTimeInterval time = [zone secondsFromGMTForDate:date];// 以秒为单位返回当前时间与系统格林尼治时间的差
NSDate *nowDate = [date dateByAddingTimeInterval:time];
NSTimeInterval timeInterval = [nowDate timeIntervalSince1970];
return timeInterval;
}
4.字符串UT-8编码 与解码
编码：
iOS9以前格式：
NSString*hStr =@"你好啊";
NSString*hString = [hStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSLog(@"hString === %@",hString);
iOS9 以后格式：
NSString*hString = [hStr stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];
解码
iOS9之前：
NSString*str3 =@"\u5982\u4f55\u8054\u7cfb\u5ba2\u670d\u4eba\u5458\uff1f";
NSString*str5 = [str3 stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSLog(@"str5 ==== %@",str5);
iOS9之后
NSString*str5 = [str3 stringByRemovingPercentEncoding];
