1:在XCode6之后使用pch：
屏幕快照 2016-01-14 上午11.37.22.png
修改工程配置文件，将创建的PCH file的路径添加到TARGERS->Build Settings->Apple LLVM ->Prefix Header 的选项中去，注意Debug和Release两栏都要添加：
屏幕快照 2016-01-14 上午11.37.47.png
注意使用$(SRCROOT)关键字代替项目文件之前的文件索引。这样文件位置变化就不会造成错误啦。
$(SRCROOT)/JYPickViewDemo/JYPickViewDemo-Prefix.pch
2:错误：ld: 15 duplicate symbols for architecture x86_64
屏幕快照 2016-01-16 下午3.08.28.png
搜索工程目录文件并没有发现重复。然而：
屏幕快照 2016-01-16 下午3.09.38.png
删去上图中的重复文件即可。
注意：imageView的userInteractionEnabled会影响到Button的点击事件
[self.container addSubview:imageView];
[imageView addSubview:Button];
如果想输出2016-07-07 这样的格式，在%后面加上02
NSString *birthDay = [NSString stringWithFormat:@"%ld-%02ld-%02ld", self.datePicker.date.year, self.datePicker.date.month, (long)self.self.datePicker.date.day];
对于collectionView和tableView，注意一下属性
self.edgesForExtendedLayout = UIRectEdgeNone;
self.automaticallyAdjustsScrollViewInsets = NO;
编译合并静态库
lipo -create /Users/jieyuanzhuang/Library/Developer/Xcode/DerivedData/uiforyysdk-ftqeflovhezxvpbkmqwihldszywq/Build/Products/Debug-iphonesimulator/libuiforyysdk.a /Users/jieyuanzhuang/Library/Developer/Xcode/DerivedData/uiforyysdk-ftqeflovhezxvpbkmqwihldszywq/Build/Products/Release-iphoneos/libuiforyysdk.a -output /Users/jieyuanzhuang/Desktop/libuiforyysdk.a
UITextField的异常情况，如下图
@implementation UITextField(UITextFieldForbbidenPaste)
- (BOOL)canPerformAction:(SEL)action withSender:(id)sender {
if (action == @selector(paste:)) {
return NO;
}
return [super canPerformAction:action withSender:sender];
}
是因为上面的代码造成的。
自定义present的tip
How to present view controller from right to left in iOS using Swift
Objc
CATransition *transition = [[CATransition alloc] init];
transition.duration = 0.5;
transition.type = kCATransitionPush;
transition.subtype = kCATransitionFromRight;
[self.view.window.layer addAnimation:transition forKey:kCATransition];
[self presentViewController:dashboardWorkout animated:false completion:nil];
Swift 3
let transition = CATransition()
transition.duration = 0.5
transition.type = kCATransitionPush
transition.subtype = kCATransitionFromRight
view.window!.layer.add(transition, forKey: kCATransition)
present(dashboardWorkout, animated: false, completion: nil)
蓝色文件夹和黄色文件夹
蓝色文件夹（folder）一般作为资源文件夹使用，与黄色文件夹的主要区别是不参与编译，所以说如果你在这些文件夹下编写的逻辑代码是不参与编译的，其他文件也不能直接引用它们，若引用其中文件需要全路径。
添加方式：
选择Create folder references
黄色文件夹（group）是逻辑文件夹，主要是为了逻辑上的分组，如果手动创建（通过New Group选项）group并不会真正创建一个文件夹文件，该文件夹下的文件则会散乱的存放在工程根目录下。当然我们通常会让Xcode中的文件树与实际工程文件中的文件树保持一致。
选择Create groups
最后来说明一下Copy items if needed这个选项
勾选后，会自动复制一份相同的文件到你的工程中，引用的是复制后在工程目录中的位置。若不勾选，文件的引用位置则是文件的原位置（不建议这样做，如果该文件在工程外被删除，工程则无法引用，所以还是复制一份到工程中，这样更利于工程文件的管理）。
关于自定义searchBar
#import "UISearchBar+Add.h"
@interface GRCustomSearchBar ()<UISearchBarDelegate>
@property (strong, nonatomic) UILabel *searchBarPlaceHolderLabel;
@end
@implementation GRCustomSearchBar
- (id)initWithFrame:(CGRect)frame{
self = [super initWithFrame:frame];
if (self) {
[self conficUI];
}
return self;
}
- (id)initWithCoder:(NSCoder *)aDecoder{
self = [super initWithCoder:aDecoder];
if (self) {
[self conficUI];
}
return self;
}
- (void)dealloc{
self.delegate = nil;
}
- (void)conficUI{
self.delegate = self;
self.backgroundImage = [UIImage new];
self.barTintColor = [UIColor whiteColor];
UITextField *searchField = [self valueForKey:@"searchField"];
if (searchField) {
searchField.backgroundColor = [UIColor whiteColor];
searchField.layer.cornerRadius = 5.0f;
searchField.layer.borderColor = [UIColor whiteColor].CGColor;
searchField.layer.borderWidth = 1;
searchField.layer.masksToBounds = YES;
//修正光标颜色
[searchField setTintColor:RGB(51, 51, 51)];
}
//设置输入框文字颜色和字体
[self fm_setTextColor:RGB(51, 51, 51)];
[self fm_setTextFont:[UIFont systemFontOfSize:16]];
//自定义 PlaceHolder
UILabel *label = [UILabel new];
label.frame = CGRectMake(42, 8, 250, 28);
label.text = @"型号，材料，风格类型";
label.font = [UIFont systemFontOfSize:16];
label.textColor = RGB(229, 229, 229);
self.searchBarPlaceHolderLabel = label;
[self addSubview:label];
//自定义搜索Icon
//先设置一个leftView使得searchField光标右移
UIButton *tmpButton = [[UIButton alloc]initWithFrame:CGRectMake(0, 0, 18, self.width)];
searchField.leftView = tmpButton;
[searchField setLeftViewMode:UITextFieldViewModeAlways];
UIButton *searchButton = [UIButton buttonWithType:UIButtonTypeCustom];
[searchButton setImage:[UIImage imageNamed:@"搜索"] forState:UIControlStateNormal];
[searchField addSubview:searchButton];
//Autolayout
searchButton.translatesAutoresizingMaskIntoConstraints = NO;
NSDictionary *views = NSDictionaryOfVariableBindings(searchButton);
//设置水平方向约束
[searchField addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"|-[searchButton(21)]" options:NSLayoutFormatAlignAllRight | NSLayoutFormatAlignAllLeft metrics:nil views:views]];
//设置高度约束
[searchField addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[searchButton(21)]" options:NSLayoutFormatAlignAllTop | NSLayoutFormatAlignAllBottom metrics:nil views:views]];
//设置垂直方向居中约束
[searchField addConstraint:[NSLayoutConstraint constraintWithItem:searchButton attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:searchField attribute:NSLayoutAttributeCenterY multiplier:1 constant:0]];
}
#pragma mark - UISearchBarDelegate
- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText {
self.searchBarPlaceHolderLabel.hidden = searchText.length > 0;
}
- (BOOL)searchBar:(UISearchBar *)searchBar shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text{
self.searchBarPlaceHolderLabel.hidden = searchBar.text.length > 0;
return YES;
}
@end
其中UISearchBar+Add.h
#import "UISearchBar+Add.h"
@implementation UISearchBar (Add)
- (void)fm_setTextFont:(UIFont *)font {
if (IS_IOS9) {
[UITextField appearanceWhenContainedInInstancesOfClasses:@[[UISearchBar class]]].font = font;
}else {
[[UITextField appearanceWhenContainedIn:[UISearchBar class], nil] setFont:font];
}
}
- (void)fm_setTextColor:(UIColor *)textColor {
if (IS_IOS9) {
[UITextField appearanceWhenContainedInInstancesOfClasses:@[[UISearchBar class]]].textColor = textColor;
}else {
[[UITextField appearanceWhenContainedIn:[UISearchBar class], nil] setTextColor:textColor];
}
}
- (void)fm_setCancelButtonTitle:(NSString *)title {
if (IS_IOS9) {
[[UIBarButtonItem appearanceWhenContainedInInstancesOfClasses:@[[UISearchBar class]]] setTitle:title];
}else {
[[UIBarButtonItem appearanceWhenContainedIn:[UISearchBar class], nil] setTitle:title];
}
}
- (void)fm_setCancelButtonFont:(UIFont *)font {
NSDictionary *textAttr = @{NSFontAttributeName : font};
if (IS_IOS9) {
[[UIBarButtonItem appearanceWhenContainedInInstancesOfClasses:@[[UISearchBar class]]] setTitleTextAttributes:textAttr forState:UIControlStateNormal];
}else {
[[UIBarButtonItem appearanceWhenContainedIn:[UISearchBar class], nil] setTitleTextAttributes:textAttr forState:UIControlStateNormal];
}
}
@end
然而遇到一个很无解的问题：
当输入超过一行的时候，光标向下偏移。
UIImageView *arrowDown = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"p-dropdown"]];
arrowDown.frame = CGRectMake(0, 0, 26, 22);
_province.rightViewMode = UITextFieldViewModeAlways;
_province.rightView = arrowDown;
_address.rightViewMode = UITextFieldViewModeAlways;
_address.rightView = arrowDown;
上面的这种写法会导致app 卡死，因为两个不同的UITextField不能使用相同的leftView或rightView.
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