1.磁盤總空間大小
+ (CGFloat)diskOfAllSizeMBytes
{
CGFloat size = ;
NSError *error;
NSDictionary *dic = [[NSFileManager defaultManager] attributesOfFileSystemForPath:NSHomeDirectory() error:&error];
if (error) {
#ifdef DEBUG
NSLog(@"error: %@", error.localizedDescription);
#endif
}else{
NSNumber *number = [dic objectForKey:NSFileSystemSize];
size = [number floatValue]//;
}
return size;
}
2.磁盤可用空間大小
+ (CGFloat)diskOfFreeSizeMBytes
{
CGFloat size = ;
NSError *error;
NSDictionary *dic = [[NSFileManager defaultManager] attributesOfFileSystemForPath:NSHomeDirectory() error:&error];
if (error) {
#ifdef DEBUG
NSLog(@"error: %@", error.localizedDescription);
#endif
}else{
NSNumber *number = [dic objectForKey:NSFileSystemFreeSize];
size = [number floatValue]//;
}
return size;
}
3.将字元串數組按照元素首字母順序進行排序分組
+ (NSDictionary *)dictionaryOrderByCharacterWithOriginalArray:(NSArray *)array
{
if (array.count == ) {
return nil;
}
for (id obj in array) {
if (![obj isKindOfClass:[NSString class]]) {
return nil;
}
}
UILocalizedIndexedCollation *indexedCollation = [UILocalizedIndexedCollation currentCollation];
NSMutableArray *objects = [NSMutableArray arrayWithCapacity:indexedCollation.sectionTitles.count];
//建立27個分組數組
for (int i = ; i < indexedCollation.sectionTitles.count; i++) {
NSMutableArray *obj = [NSMutableArray array];
[objects addObject:obj];
}
NSMutableArray *keys = [NSMutableArray arrayWithCapacity:objects.count];
//按字母順序進行分組
NSInteger lastIndex = -;
for (int i = ; i < array.count; i++) {
NSInteger index = [indexedCollation sectionForObject:array[i] collationStringSelector:@selector(uppercaseString)];
[[objects objectAtIndex:index] addObject:array[i]];
lastIndex = index;
}
//去掉空數組
for (int i = ; i < objects.count; i++) {
NSMutableArray *obj = objects[i];
if (obj.count == ) {
[objects removeObject:obj];
}
}
//擷取索引字母
for (NSMutableArray *obj in objects) {
NSString *str = obj[];
NSString *key = [self firstCharacterWithString:str];
[keys addObject:key];
}
NSMutableDictionary *dic = [NSMutableDictionary dictionary];
[dic setObject:objects forKey:keys];
return dic;
}
4.将字元串數組按照元素首字母順序進行排序分組
+ (NSDictionary *)dictionaryOrderByCharacterWithOriginalArray:(NSArray *)array
{
if (array.count == ) {
return nil;
}
for (id obj in array) {
if (![obj isKindOfClass:[NSString class]]) {
return nil;
}
}
UILocalizedIndexedCollation *indexedCollation = [UILocalizedIndexedCollation currentCollation];
NSMutableArray *objects = [NSMutableArray arrayWithCapacity:indexedCollation.sectionTitles.count];
//建立27個分組數組
for (int i = ; i < indexedCollation.sectionTitles.count; i++) {
NSMutableArray *obj = [NSMutableArray array];
[objects addObject:obj];
}
NSMutableArray *keys = [NSMutableArray arrayWithCapacity:objects.count];
//按字母順序進行分組
NSInteger lastIndex = -;
for (int i = ; i < array.count; i++) {
NSInteger index = [indexedCollation sectionForObject:array[i] collationStringSelector:@selector(uppercaseString)];
[[objects objectAtIndex:index] addObject:array[i]];
lastIndex = index;
}
//去掉空數組
for (int i = ; i < objects.count; i++) {
NSMutableArray *obj = objects[i];
if (obj.count == ) {
[objects removeObject:obj];
}
}
//擷取索引字母
for (NSMutableArray *obj in objects) {
NSString *str = obj[];
NSString *key = [self firstCharacterWithString:str];
[keys addObject:key];
}
NSMutableDictionary *dic = [NSMutableDictionary dictionary];
[dic setObject:objects forKey:keys];
return dic;
}
5.對圖檔進行濾鏡處理
// 懷舊 --> CIPhotoEffectInstant 單色 --> CIPhotoEffectMono
// 黑白 --> CIPhotoEffectNoir 褪色 --> CIPhotoEffectFade
// 色調 --> CIPhotoEffectTonal 沖印 --> CIPhotoEffectProcess
// 歲月 --> CIPhotoEffectTransfer 鉻黃 --> CIPhotoEffectChrome
// CILinearToSRGBToneCurve, CISRGBToneCurveToLinear, CIGaussianBlur, CIBoxBlur, CIDiscBlur, CISepiaTone, CIDepthOfField
+ (UIImage *)filterWithOriginalImage:(UIImage *)image filterName:(NSString *)name
{
CIContext *context = [CIContext contextWithOptions:nil];
CIImage *inputImage = [[CIImage alloc] initWithImage:image];
CIFilter *filter = [CIFilter filterWithName:name];
[filter setValue:inputImage forKey:kCIInputImageKey];
CIImage *result = [filter valueForKey:kCIOutputImageKey];
CGImageRef cgImage = [context createCGImage:result fromRect:[result extent]];
UIImage *resultImage = [UIImage imageWithCGImage:cgImage];
CGImageRelease(cgImage);
return resultImage;
}
6.對圖檔進行模糊處理
// CIGaussianBlur ---> 高斯模糊
// CIBoxBlur ---> 均值模糊(Available in iOS 9.0 and later)
// CIDiscBlur ---> 環形卷積模糊(Available in iOS 9.0 and later)
// CIMedianFilter ---> 中值模糊, 用于消除圖像噪點, 無需設定radius(Available in iOS 9.0 and later)
// CIMotionBlur ---> 運動模糊, 用于模拟相機移動拍攝時的掃尾效果(Available in iOS 9.0 and later)
+ (UIImage *)blurWithOriginalImage:(UIImage *)image
blurName:(NSString *)name
radius:(NSInteger)radius
{
CIContext *context = [CIContext contextWithOptions:nil];
CIImage *inputImage = [[CIImage alloc] initWithImage:image];
CIFilter *filter;
if (name.length != 0) {
filter = [CIFilter filterWithName:name];
[filter setValue:inputImage forKey:kCIInputImageKey];
if (![name isEqualToString:@"CIMedianFilter"]) {
[filter setValue:@(radius) forKey:@"inputRadius"];
}
CIImage *result = [filter valueForKey:kCIOutputImageKey];
CGImageRef cgImage = [context createCGImage:result fromRect:[result extent]];
UIImage *resultImage = [UIImage imageWithCGImage:cgImage];
CGImageRelease(cgImage);
return resultImage;
}else{
return nil;
}
}
7.跳轉到系統的相關界面:
/*
* 需要添加一個字段
* 藍色的項目工程檔案 -> Info -> URL Types -> 添加一個 -> 設定URL Sch**** 為 prefs的url
NSURL *url = [NSURL URLWithString:@"prefs:root=WIFI"];
[[UIApplication sharedApplication] openURL:url];
跳轉到其他的界面的字段(不全,詳細看連結)
About — prefs:root=General&path=About
Accessibility — prefs:root=General&path=ACCESSIBILITY
AirplaneModeOn— prefs:root=AIRPLANE_MODE
Auto-Lock — prefs:root=General&path=AUTOLOCK
Brightness — prefs:root=Brightness
Bluetooth — prefs:root=General&path=Bluetooth
Date& Time — prefs:root=General&path=DATE_AND_TIME
FaceTime — prefs:root=FACETIME
General— prefs:root=General
原文連結:http://www.jianshu.com/p/f48309b
*/
8.建立一張實時模糊效果 View (毛玻璃效果)
//Avilable in iOS and later
+ (UIVisualEffectView *)effectViewWithFrame:(CGRect)frame
{
UIBlurEffect *effect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight];
UIVisualEffectView *effectView = [[UIVisualEffectView alloc] initWithEffect:effect];
effectView.frame = frame;
return effectView;
}
9.設定Label的行間距
+ (void)setLineSpaceWithString:(UILabel *)label
{
NSMutableAttributedString *attributedString =
[[NSMutableAttributedString alloc] initWithString:label.text];
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
[paragraphStyle setLineSpacing:];
//調整行間距
[attributedString addAttribute:NSParagraphStyleAttributeName
value:paragraphStyle
range:NSMakeRange(, [label.text length])];
label.attributedText = attributedString;
}
10.讓Plain風格的TableView的區頭可以”不懸停”(可以直接百度搜到):
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
if(scrollView == self.myTab) {
CGFloat sectionHeaderHeight = ;
if (scrollView.contentOffset.y=) {
scrollView.contentInset = UIEdgeInsetsMake(-scrollView.contentOffset.y, , , );
} else if (scrollView.contentOffset.y>=sectionHeaderHeight) {
scrollView.contentInset = UIEdgeInsetsMake(-sectionHeaderHeight, , , );
}
}
}
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