iOS常用知识点总结

1.点击空白回收键盘

- (void)touchesEnded:(NSSet*)touches withEvent:(UIEvent*)event {

UITouch*touch = [touchesanyObject];

UIView*view = [touchview];//获取被点击的view

if([viewisKindOfClass:[ActApplyNoSetViewclass]]) {

[self.view endEditing:YES];

}

}

2.打赏时输入金额正则表达式

-(BOOL)textField:(UITextField*)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString*)string{

NSString*toString = [textField.textstringByReplacingCharactersInRange:rangewithString:string];

if(toString.length>0) {

NSString*stringRegex =@"(\\+|\\-)?(([0]|(0[.]\\d{0,2}))|([1-9]\\d{0,2}(([.]\\d{0,2})?)))?";

NSPredicate*phoneTest = [NSPredicatepredicateWithFormat:@"SELF MATCHES %@", stringRegex];

BOOLflag = [phoneTestevaluateWithObject:toString];

if(!flag) {

returnNO;

}

}

returnYES;

}

3.项目QQ联系我们点击 打开QQ 添加好友或群

NSString *urlStr = [NSString stringWithFormat:@"mqqapi://card/show_pslcard?src_type=internal&version=1&uin=%@&key=%@&card_type=group&source=external", @"483438261",@"ff8c5866c16b3f4b80ed7606d6aecab8fd8242010e25d013b623d3e364461b96"];

NSURL *url = [NSURL URLWithString:urlStr];

if([[UIApplication sharedApplication] canOpenURL:url]){

[[UIApplication sharedApplication] openURL:url];

4.navibar字体颜色

[self.navigationController.navigationBar setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor blackColor],NSForegroundColorAttributeName,nil]];

5.ViewController 向后返回到指定VC

for(UIViewController*controllerinself.navigationController.viewControllers) {

if([controllerisKindOfClass:[UserTouPiaoControlVCclass]]) {

[self.navigationControllerpopToViewController:controlleranimated:YES];

}

6.获取webView的高度

_webHeight= [[webViewstringByEvaluatingJavaScriptFromString:@"document.body.scrollHeight"]floatValue];

7.duplicate symbols for architecture x86_64错误

错误原因一般是重复倒入相同的类

8.cocoapods 安装命令

pod install --verbose --no-repo-update

9.回收键盘

[self.view endEditing:YES];

10.判断图片格式

- (NSString*)typeForImageData:(NSData*)data {

uint8_tc;

[datagetBytes:&clength:1];

switch(c) {

case0xFF:

return@"image/jpeg";

case0x89:

return@"image/png";

case0x47:

return@"image/gif";

case0x49:

case0x4D:

return@"image/tiff";

}

returnnil;

}

十一、设置父视图的透明度不影响子视图

aView.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.5];

十二、tableView滑倒最顶部

[_tableView setContentOffset:CGPointMake(0,0) animated:NO];

持续更新中～