1:contentSize、contentInset和contentOffset区别
contentSize 是scrollview中的一个属性，它代表scrollview中的可显示区域，假如有一个scrollview，它的frame为(0,0,320,480),而它的contentSize为(320,960).也就是说，这个scrollview整个内容的大小为(320,960),要通过上下滑动scrollview来查看(320,480)后的内容。
contentOffset 是scrollview当前显示区域顶点相对于frame顶点的偏移量，比如上个例子你拉到最下面，contentoffset就是(0,-480)，也就是y偏移了480
contentInset 是scrollview中contentView.frame.origin与scrollview.frame.origin的关系，比如contentView的frame为(0,30,320,480),那么contentInset则为(0,30),它也可以设置上下左右
2:IOS虚拟器安装其它Simulator
下载后的dmg安装.这里主要以iOS7.0模拟器的离线安装为例进行说明，其他版本以此类推：
下载ios_7_0_simulator.dmg后打开dmg文件，可以看到安装包iphoneSimulatorSDK7_0.pkg，使用安装器安装此安装包，默认会安装在所选分区的
/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator7.0.sdk目录下，完全退出Xcode后将刚才安装的iPhoneSimulator7.0.sdk整个目录复制或移动到/applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs目录下即可，(Xcode.app右键可以"显示包内容“)重新启动Xcode一般就可以使用相应版本的模拟器进行开发和调试了。离线安装还有一个简单的办法就是将以前安装过的旧版本的Xcode如Xcode5.0.2下面已经安装好了的iOS模拟器直接复制过来使用，目录位置都一样，都是在Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs里面。这样就不用再下载离线安装包了。
3:输入框中的inputaccessoryview和inputview
UITextFields和UITextView有一个inputAccessoryView的属性，当你想在键盘上展示一个自定义的view时，你就可以设置该属性。你设置的view就会自动和键盘keyboard一起显示了。需要注意的是，你所自定义的view既不应该处在其他的视图层里，也不应该成为其他视图的子视图。其实也就是说，你所自定义的view只需要赋给属性inputAccessoryView就可以了，不要再做其他多余的操作。
inputview则是键盘视图，当其为nil时则弹出的是系统默认的键盘；
实例一(给键盘上方设置一个工具条的方式)：- (void)createKeyboardTool
{
keyboardTool= [[UIToolbar alloc] initWithFrame: CGRectMake(kZero, kZero, kScreenW,44.0f)];
NSMutableArray*myToolBarItems =[NSMutableArray array];//创建键盘工具条上面的按钮,并设置点击事件UIBarButtonItem *cancelBtn =[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemReply target:self action:@selector(cancelAction)];
UIBarButtonItem*space =[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:@selector(saveAction)];
UIBarButtonItem*saveBtn =[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(saveAction)];
[myToolBarItems addObject:cancelBtn];
[myToolBarItems addObject:space];
[myToolBarItems addObject:saveBtn];
keyboardTool.items=myToolBarItems;
}//inputAccessoryView:设置键盘顶部显示的工具条;inputView:自定义键盘commentTextView = [[UITextView alloc]initWithFrame:CGRectMake(kZero, kZero, kScreenW,200)];
[commentTextView becomeFirstResponder];
commentTextView.inputAccessoryView=keyboardTool;
实例二(修改键盘视图，进行切换自定义视图跟系统自带视图)：/**
* 切换键盘*/- (void)switchKeyboard
{//self.textView.inputView == nil : 使用的是系统自带的键盘if(self.textView.inputView ==nil) {//切换为自定义的表情键盘 emtionKeyboard为一个视图self.textView.inputView =self.emotionKeyboard;//显示键盘按钮self.toolbar.showKeyboardButton =YES;
}else{//切换为系统自带的键盘self.textView.inputView =nil;//显示表情按钮self.toolbar.showKeyboardButton =NO;
}//开始切换键盘 这个是为固定用的self.switchingKeybaord =YES;//退出键盘[self.textView endEditing:YES];
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.1* NSEC_PER_SEC)), dispatch_get_main_queue(), ^{//弹出键盘,让其慢点实现[self.textView becomeFirstResponder];//结束切换键盘self.switchingKeybaord =NO;
});
}/**
* 键盘的frame发生改变时调用（显示、隐藏等）*/- (void)keyboardWillChangeFrame:(NSNotification *)notification
{//如果正在切换键盘，就不要执行后面的代码if(self.switchingKeybaord)return;
NSDictionary*userInfo =notification.userInfo;//动画的持续时间doubleduration =[userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];//键盘的frameCGRect keyboardF =[userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];//执行动画[UIView animateWithDuration:duration animations:^{//工具条的Y值 == 键盘的Y值 - 工具条的高度if(keyboardF.origin.y > self.view.height) {//键盘的Y值已经远远超过了控制器view的高度self.toolbar.y = self.view.height -self.toolbar.height;
}else{
self.toolbar.y= keyboardF.origin.y -self.toolbar.height;
}
}];
}
4:修改UISearchBar中关于cannel取消的文字
-(UISearchBar *)mySearchBar
{if(_mySearchBar==nil) {
_mySearchBar=[[UISearchBar alloc]init];
_mySearchBar.showsCancelButton=YES;
_mySearchBar.delegate=self;
[_mySearchBar sizeToFit];
[_mySearchBar setPlaceholder:@"请输入"];
[_mySearchBar setY:20];//处理cannel的文字显示for(id itemin[_mySearchBar subviews]) {for(id ccin[item subviews])
{if([cc isKindOfClass:[UIButtonclass]]) {
UIButton*btn=(UIButton *)cc;
[btn setTitle:@"取消"forState:UIControlStateNormal];
}
}
}
}return_mySearchBar;
}
如果是获得瞧点才显示出取消可以在这个委托里面进行设置:/**
* @author wujunyang, 15-06-24 11:06:44
*
* @brief 修改cancel的显示文字 必先把showscancelButton设置为yes
* @param searchBar <#searchBar description#>*/- (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar
{
searchBar.showsCancelButton=YES;for(id itemin[searchBar subviews]) {for(id ccin[item subviews])
{if([cc isKindOfClass:[UIButtonclass]]) {
UIButton*btn=(UIButton *)cc;
[btn setTitle:@"取消"forState:UIControlStateNormal];
}
}
}
}
5:关于navigationController中增加控件时push跳转及跳回
在子页navigationController增加控件,回跳时它是没办法自个销除，所以要手动增加一个销除nav所增加的控件，否则子页的那个控件会被重叠显示在父页的nav上；如下一个实例：
在viewDidLoad里//加载控件[self.navigationController.view addSubview:self.mySearchBar];
(void)viewWillDisappear:(BOOL)animated {//这句也可以写在回跳前[self.mySearchBar removeFromSuperview];
[super viewWillDisappear:animated];
}
6:整个视图点击都对键盘进行收缩
- (void)viewDidLoad {
[super viewDidLoad];
UITapGestureRecognizer*tapGr=[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(viewTapped:)];//如果没有这句在view中的Button等可能无法触发ToucheUpInside事件tapGr.cancelsTouchesInView=NO;
[self.view addGestureRecognizer:tapGr];
}-(IBAction)BtnAction:(id)sender {
NSLog(@"%@",self.myTextField.text);
}-(void)viewTapped:(UITapGestureRecognizer *)tapGr
{
[self.myTextField resignFirstResponder];
}- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
@end
7:针对第三方插件为mrc，而工程为arc的调用
对第三方插件的.m文件进行设置，工程targets-build phases－compile sources 设置-fno-objc-arc
有些是双星如 PLTexture**PReviewTextures;
在arc下面则要修改成：PLTexture* __unsafe_unretained *previewTextures;
8:通知的方式实现键盘的收缩布局问题
/**
* 添加工具条*/- (void)setupToolbar
{//1.添加工具条IWComposeToolbar *toolbar =[[IWComposeToolbar alloc] init];
toolbar.delegate=self;
CGFloat toolbarH=35;
CGFloat toolbarW=self.view.width;
CGFloat toolbarY= self.view.height -toolbarH;
toolbar.frame= CGRectMake(0, toolbarY, toolbarW, toolbarH);
[self.view addSubview:toolbar];
self.toolbar=toolbar;//2.监听键盘的弹出和隐藏//键盘的frame(位置)即将改变, 就会发出UIKeyboardWillChangeFrameNotification//键盘即将弹出, 就会发出UIKeyboardWillShowNotification[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotificationobject:nil];//键盘即将隐藏, 就会发出UIKeyboardWillHideNotification[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillHide:) name:UIKeyboardWillHideNotificationobject:nil];
}#pragmamark - 键盘处理/**
* 键盘即将隐藏*/- (void)keyboardWillHide:(NSNotification *)note
{//1.键盘弹出需要的时间CGFloat duration =[note.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];//2.动画[UIView animateWithDuration:duration animations:^{
self.toolbar.transform=CGAffineTransformIdentity;
}];
}/**
* 键盘即将弹出*/- (void)keyboardWillShow:(NSNotification *)note
{//1.键盘弹出需要的时间CGFloat duration =[note.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];//2.动画[UIView animateWithDuration:duration animations:^{//取出键盘高度CGRect keyboardF =[note.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
CGFloat keyboardH=keyboardF.size.height;
self.toolbar.transform= CGAffineTransformMakeTranslation(0, -keyboardH);
}];
}//通知要销掉- (void)dealloc
{
[[NSNotificationCenter defaultCenter] removeObserver:self];
}
注意：[self.textView resignFirstResponder];放弃瞧点
还有可以监听输入内容的变化：//2.监听textView文字的改变[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textChange) name:UITextViewTextDidChangeNotificationobject:textView];
9:封装一个uivew带有按键工具栏的实例
.h文件内容：
#import<UIKit/UIKit.h>@class IWComposeToolbar;
typedefenum{
IWComposeToolbarButtonTypeCamera,
IWComposeToolbarButtonTypePicture,
IWComposeToolbarButtonTypeMention,
IWComposeToolbarButtonTypeTrend,
IWComposeToolbarButtonTypeEmotion
} IWComposeToolbarButtonType;
@protocol IWComposeToolbarDelegate<NSObject>@optional- (void)composeToolbar:(IWComposeToolbar *)toolbar didClickButton:(IWComposeToolbarButtonType)butonType;
@end
@interface IWComposeToolbar : UIView
@property (weak, nonatomic) id<IWComposeToolbarDelegate>delegate;
@end
.m文件内容：
#import"IWComposeToolbar.h"@implementation IWComposeToolbar-(id)initWithFrame:(CGRect)frame
{
self=[super initWithFrame:frame];if(self) {//1.设置背景self.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageWithName:@"compose_toolbar_background"]];//2.添加按钮[self addButtonWithIcon:@"compose_camerabutton_background"highIcon:@"compose_camerabutton_background_highlighted"tag:IWComposeToolbarButtonTypeCamera];
[self addButtonWithIcon:@"compose_toolbar_picture"highIcon:@"compose_toolbar_picture_highlighted"tag:IWComposeToolbarButtonTypePicture];
[self addButtonWithIcon:@"compose_mentionbutton_background"highIcon:@"compose_mentionbutton_background_highlighted"tag:IWComposeToolbarButtonTypeMention];
[self addButtonWithIcon:@"compose_trendbutton_background"highIcon:@"compose_trendbutton_background_highlighted"tag:IWComposeToolbarButtonTypeTrend];
[self addButtonWithIcon:@"compose_emoticonbutton_background"highIcon:@"compose_emoticonbutton_background_highlighted"tag:IWComposeToolbarButtonTypeEmotion];
}returnself;
}- (void)addButtonWithIcon:(NSString *)icon highIcon:(NSString *)highIcon tag:(IWComposeToolbarButtonType)tag
{
UIButton*button =[[UIButton alloc] init];
button.tag=tag;
[button addTarget:self action:@selector(buttonClick:) forControlEvents:UIControlEventTouchUpInside];
[button setImage:[UIImage imageWithName:icon] forState:UIControlStateNormal];
[button setImage:[UIImage imageWithName:highIcon] forState:UIControlStateHighlighted];
[self addSubview:button];
}/**
* 监听按钮点击*/- (void)buttonClick:(UIButton *)button
{if([self.delegaterespondsToSelector:@selector(composeToolbar:didClickButton:)]) {
[self.delegatecomposeToolbar:self didClickButton:button.tag];
}
}- (void)layoutSubviews
{
[super layoutSubviews];intcount =self.subviews.count;
CGFloat buttonW= self.width /count;
CGFloat buttonH=self.height;for(inti =0; i<count; i++) {
UIButton*button =self.subviews[i];
CGFloat buttonX= buttonW *i;
button.frame= CGRectMake(buttonX,0, buttonW, buttonH);
}
}
@end