iOS 开发小常识 开发笔记

一   自定义push方法

/*  参数说明

*  controllerName : push的目标页 例：@“testcontroll”    ---注意不带.h

*  isNibPage     : 目标页是否带 xib 文件

*  setHideTabBar : 当前页是否隐藏 tabBar      -----注意 是当前页 非目标页

*  setDelegate   : 设置委托

*/

- (void)pushNewViewController:(NSString *)controllerName isNibPage:(BOOL) _isNib setHideTabBar:(BOOL) _bool setDelegate:(BOOL) _setdelegate{

if (controllerName.length <= 0) {

return;

}

Class   class_Page = NSClassFromString((NSString *)controllerName);

id viewCtrl_Page = _isNib ? [[class_Page alloc] initWithNibName:controllerName bundle:nil]

: [[class_Page alloc] init];

if (_setdelegate) { [viewCtrl_Page setDelegate:self]; }

if (!m_Params)    { m_Params = [[NSMutableDictionaryalloc]init]; }

[m_Params setValue:_bool == YES ? @"1" : @"0" forKey:@"HideTabBar"];

[viewCtrl_Page setM_Params:[m_Params retain]];

if (isLoginPage) {

if ([GlobalisUserLogin]) {

[self.navigationControllerpushViewController:viewCtrl_Page animated:YES];

}

else{

[selfshowLoginController];

}

}

else

[self.navigationControllerpushViewController:viewCtrl_Page animated:YES];

[viewCtrl_Page release];

if (m_Params) {

[m_Params release];

}

}

二       根据TableView里的button获取父级UITableViewCell

1.   通过对像的父级查找

UIButton *btn_checkBox = (UIButton *)sender;

UITableViewCell * cell = (UITableViewCell *)[btn_checkBox superview];

NSIndexPath* indexPath = [m_tableViewindexPathForCell:cell];

2.   通过点击座标

// 检查用户点击按钮时的位置，并转发事件到对应的accessory tapped事件
- (void)btnClicked:(id)sender event:(id)event
{
     NSSet *touches = [event allTouches];
     UITouch *touch = [touches anyObject];
     CGPoint currentTouchPosition = [touch locationInView:self.tableView];
     NSIndexPath *indexPath = [self.tableView indexPathForRowAtPoint:currentTouchPosition];
     if(indexPath != nil)
     {
         [self tableView:self.tableView accessoryButtonTappedForRowWithIndexPath:indexPath];
     }
}

三　　常常要算一段文字的长度和高度。下面这段代码可以帮到你

CGSize  fontsize = [tmpCoupon.couponDescsizeWithFont:[UIFontboldSystemFontOfSize:13] constrainedToSize:CGSizeMake(162, MAXFLOAT) lineBreakMode:NSLineBreakByWordWrapping];

　 // 计算文本的大小  ios7.0

CGSize textSize = [textViewTemple.text boundingRectWithSize:CGSizeMake(self.imagewidth, MAXFLOAT)                                                         options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading // 文本绘制时的附加选项

attributes:dic  context:nil].size;

四　　文本编辑的时候键盘档住页面，下面代码自动收缩

- (void)textFieldDidBeginEditing:(UITextField *)textField{

　　CGRect frame = textField.frame;

　　int offset = frame.origin.y + 32 - (self.view.frame.size.height - 216.0-10);

　　NSTimeInterval animationDuration = 0.30f;

     [UIView beginAnimations:@"ResizeForKeyBoard" context:nil];

[UIView setAnimationDuration:animationDuration];
float width = self.view.frame.size.width;
float height = self.view.frame.size.height;
if(offset > 0){
CGRect rect = CGRectMake(0.0f, -offset,width,height);
self.view.frame = rect;
}
[UIView commitAnimations];

}

- (BOOL)textFieldShouldReturn:(UITextField *)textField{
NSTimeInterval animationDuration = 0.30f;
[UIView beginAnimations:@"ResizeForKeyboard" context:nil];
[UIView setAnimationDuration:animationDuration];
CGRect rect = CGRectMake(0.0f, 0.0f, self.view.frame.size.width, self.view.frame.size.height);
self.view.frame = rect;
[UIView commitAnimations];

[textField resignFirstResponder];
return YES;
｝

// 十六进制设置alpha值

+ (UIColor *)convertHexToRGB:(NSString *)hexString alpha:(CGFloat)alpha {

NSString *str;

if ([hexString hasPrefix:@"0x"] || [hexString hasPrefix:@"0X"]) {

str=[[NSString alloc] initWithFormat:@"%@",hexString];

}else {

str=[[NSString alloc] initWithFormat:@"0x%@",hexString];

}

int rgb;

sscanf([str cStringUsingEncoding:NSUTF8StringEncoding], "%i", &rgb);

[str release];

int red=rgb/(256*256)%256;

int green=rgb/256%256;

int blue=rgb%256;

UIColor *color=[UIColor colorWithRed:red/255.0 green:green/255.0 blue:blue/255.0 alpha:alpha];

return color;

}

五  .  数组排序

NSSortDescriptor * sortDescriptor = [[NSSortDescriptoralloc] initWithKey:@"createTime"ascending:NO];

[arrMsgListsortUsingDescriptors:[NSArrayarrayWithObject:sortDescriptor]];