1. Label的自动高度自适应与属性字符串
UILabel *label = [[UILabel alloc] init];
label.backgroundColor = [UIColor greenColor];
label.textColor = [UIColor whiteColor];
label.numberOfLines = 0;
NSString *str = @"123451dsa;flmdkalsjflnm\nf,.a\nsdl;fjsajldkfjlkasdf23455";
NSMutableAttributedString *noteStr =[[NSMutableAttributedString alloc] initWithString:str];
NSRange redRange = NSMakeRange(0, 20);
[noteStr addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:redRange];
[label setAttributedText:noteStr];
[label sizeToFit]；
NSDictionary *attributes = @{NSFontAttributeName : label.font};
CGSize size =[str boundingRectWithSize:CGSizeMake(100, 0) options:NSStringDrawingUsesLineFragmentOrigin |NSStringDrawingUsesFontLeading attributes:attributes context:nil].size;
label.frame = CGRectMake(100, 100, size.width, size.height);
[self.view addSubview:label];
2. cell label高度自适应
- 首先label的numofline设置为0
- 其次在cell的m文件中
(void)cellForHeight:(NSArray *)itemData
{
_content.lineBreakMode = NSLineBreakByWordWrapping;
_content.preferredMaxLayoutWidth = CGRectGetWidth(_content.frame);
_content.text = itemData[2];
}
-
随意一个方法中将label的lineBreakMode和lineBreakMode设置好并赋好label.text的值
-
最后实现tableview的delegate的方法
(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
BWMFoundCell *cell = [tableView dequeueReusableCellWithIdentifier:@"BWMFoundCell"];
if (!cell){
NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"BWMFoundCell" owner:self options:nil];
for (id oneObj in nib){
if ([oneObj isKindOfClass:[BWMFoundCell class]]){
cell = (BWMFoundCell *)oneObj;
}}}
NSArray *item = _dataArr[indexPath.row];
[cell cellForHeight:item];
CGSize size = [cell.contentView systemLayoutSizeFittingSize:UILayoutFittingExpandedSize];
return size.height +1;
}
3. 自定义navigationbar
- 通过重新navigationcontroler的initwithrootviewcontroller来实现
(instancetype)initWithRootViewController:(BWMFoundDetail *)rootViewController{
self = [super initWithRootViewController:rootViewController];
if (self)
{
[self.view insertSubview:[uiview new] belowSubview:self.navigationBar];
[self.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsCompact];
self.navigationBar.layer.masksToBounds = YES;}
return self;
}
// [uiview new]即为替换navigationbar的视图
- 通过改变backgroundimage和setShadowImage
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[self.navigationController.navigationBar setShadowImage:[UIImage new]];
[self.navigationController.navigationBar setBackgroundImage:[UIImage new]
forBarMetrics:UIBarMetricsDefault];
}
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
[self.navigationController.navigationBar setShadowImage:nil];
[self.navigationController.navigationBar setBackgroundImage:nil
forBarMetrics:UIBarMetricsDefault];
}
4. 更改navigationbar左右按钮位置
UIButton *buttonItem = [UIButton buttonWithType:UIButtonTypeCustom];
buttonItem.imageEdgeInsets = UIEdgeInsetsMake(0, -15, 0, 0);//
[buttonItem setImage:[UIImage imageNamed:@"icon_arrow_back"] forState:UIControlStateNormal];
[buttonItem sizeToFit];
buttonItem.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
[buttonItem addTarget:self
action:@selector(backAction)
forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *leftBarItem = [[UIBarButtonItem alloc] initWithCustomView:buttonItem];
self.navigationItem.leftBarButtonItem = leftBarItem;
- buttonItem.imageEdgeInsets = UIEdgeInsetsMake(0, -15, 0, 0) 当为图片时使用
- buttonItem.titleEdgeInsets 为字符串时使用
5. 全局设ui appdelegate中
//设置UI
[[UINavigationBar appearance] setBarTintColor:BWMColor(253, 127, 3, 1)];
[[UINavigationBar appearance] setTintColor:[UIColor whiteColor]];
[[UITabBar appearance] setTintColor:BWMColor(247, 104, 0, 1)];
[[UINavigationBar appearance] setTitleTextAttributes:@{
NSForegroundColorAttributeName : [UIColor whiteColor],
NSFontAttributeName : [UIFont boldSystemFontOfSize:16]
}];
6. 去除左按钮箭头旁边的字 并可自定义
- 新建一个类别 内容如下面所示
#import "UINavigationItem+CustomBackButtom.h"
#import <objc/runtime.h>
@implementation UINavigationItem (CustomBackButtom)
+ (void)load
{
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
Method originalMethodImp = class_getInstanceMethod(self, @selector(backBarButtonItem));
Method destMethodImp =
class_getInstanceMethod(self, @selector(myCustomBackButton_backBarbuttonItem));
method_exchangeImplementations(originalMethodImp, destMethodImp);
});
}
- (UIBarButtonItem *)backBarButtonItem
{
return [[UIBarButtonItem alloc] initWithTitle:@""
style:UIBarButtonItemStyleBordered
target:nil
action:nil];
}
static char kCustomBackButtonKey;
- (UIBarButtonItem *)myCustomBackButton_backBarbuttonItem
{
UIBarButtonItem *item = [self myCustomBackButton_backBarbuttonItem];
if (item)
{
return item;
}
item = objc_getAssociatedObject(self, &kCustomBackButtonKey);
if (!item)
{
item = [[UIBarButtonItem alloc] initWithTitle:@""
style:UIBarButtonItemStyleBordered
target:nil
action:nil];
objc_setAssociatedObject(self, &kCustomBackButtonKey, item,
OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
return item;
}
@end
7. 防止键盘挡住输入框
- 在Podfile中添入 pod 'IQKeyboardManager', '~> 3.3.7'
- //设置键盘事件
IQKeyboardManager *manager = [IQKeyboardManager sharedManager];
manager.enable = YES;
manager.shouldResignOnTouchOutside = YES;
manager.shouldToolbarUsesTextFieldTintColor = YES;
manager.enableAutoToolbar = NO;
8. 通过xib读取uivew
-
在init初始化方法中
NSArray *nib= [[NSBundle mainBundle] loadNibNamed:@"BWMDetailXYJ" owner:self options:nil]; UIView *view = [nib lastObject]; self = (uiview *)view;
9. 获得当前view的viewcontroller
- (UIViewController *)rootViewController {
for (UIView* next = [self superview]; next; next = next.superview) {
UIResponder *nextResponder = [next nextResponder];
if ([nextResponder isKindOfClass:[UIViewController class]]) {
return (UIViewController *)nextResponder;
}
}
return nil;
}
10. 自定义UITableViewCell（registerNib: 与 registerClass: 的区别）
11. macdown语法
12. 不定参数的使用
+ (void)test:(NSString *)string, ...
{
va_list args;
va_start(args, string);
if (string)
{
NSString *otherString;
while ((otherString = va_arg(args, NSString *)))
{
//依次取得所有参数
}
}
va_end(args);
}
-
说明:
va_list args： //定义一个指向个数可变的参数列表指针； va_start(args,string)：//string为第一个参数，也就是最右边的已知参数,这里就是获取第一个可选参数的地址.使参数列表指针指向函数参数列表中的第一个可选参数，函数参数列表中参数在内存中的顺序与函数声明时的顺序是一致的。 va_arg(args,NSString)：返回参数列表中指针所指的参数，返回类型为NSString，并使参数指针指向参数列表中下一个参数。 a_end(args)：清空参数列表，并置参数指针args无效
13. 隐藏Tabbar
- 一
BWMAllDevices *viewController = [BWMAllDevices new];
viewController.hidesBottomBarWhenPushed = YES;
[self.navigationController pushViewController:viewController animated:YES];
- 二
self.hidesBottomBarWhenPushed = YES;
BWMAllDevices *viewController = [BWMAllDevices new];
[self.navigationController pushViewController:viewController animated:YES];
self.hidesBottomBarWhenPushed = NO;
13. 关于(0,0)的探究
- 当有navigationbar时，tableview、scrollview的（0，0）在navigationbar下面的左上角。然而其他的view的0点却是在屏幕的左上角。是什么原因引起的呢。
- 从ios7以后，控制器有了一个新的属性，automaticallyAdjustsScrollViewInsets, 默认是YES，如果视图里面存在唯一一个UIScorllView或其子类view,那么，它会自动设置相应的内边距，这样可以让scorll占据整个视图，又不会让导航栏遮盖。
- 所以，要将scrollview及子view的0点变为屏幕左上角
self.automaticallyAdjustsScrollViewInsets = NO;
或者是
self.scrollView.contentInset = UIEdgeInsetsMake(-64, 0, 0, 0);
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